diff --git a/.ci/docker-compose-file/docker-compose-ldap.yaml b/.ci/docker-compose-file/docker-compose-ldap.yaml
index 6804f6b01..339db8d85 100644
--- a/.ci/docker-compose-file/docker-compose-ldap.yaml
+++ b/.ci/docker-compose-file/docker-compose-ldap.yaml
@@ -10,7 +10,7 @@ services:
       nofile: 1024
     image: openldap
     #ports:
-    #  - 389:389
+    #  - "389:389"
     volumes:
       - ./certs/ca.crt:/etc/certs/ca.crt
     restart: always
diff --git a/.github/workflows/build_and_push_docker_images.yaml b/.github/workflows/build_and_push_docker_images.yaml
index aa505ff37..45a96be9a 100644
--- a/.github/workflows/build_and_push_docker_images.yaml
+++ b/.github/workflows/build_and_push_docker_images.yaml
@@ -122,9 +122,10 @@ jobs:
         run: |
           ls -lR _packages/$PROFILE
           mv _packages/$PROFILE/*.tar.gz ./
+
       - name: Enable containerd image store on Docker Engine
         run: |
-          echo "$(jq '. += {"features": {"containerd-snapshotter": true}}' /etc/docker/daemon.json)" > daemon.json
+          echo "$(sudo cat /etc/docker/daemon.json | jq '. += {"features": {"containerd-snapshotter": true}}')" > daemon.json
           sudo mv daemon.json /etc/docker/daemon.json
           sudo systemctl restart docker
 
diff --git a/Makefile b/Makefile
index 2f4519cfd..b803e639b 100644
--- a/Makefile
+++ b/Makefile
@@ -10,8 +10,8 @@ include env.sh
 
 # Dashboard version
 # from https://github.com/emqx/emqx-dashboard5
-export EMQX_DASHBOARD_VERSION ?= v1.9.1
-export EMQX_EE_DASHBOARD_VERSION ?= e1.7.1
+export EMQX_DASHBOARD_VERSION ?= v1.9.2
+export EMQX_EE_DASHBOARD_VERSION ?= e1.7.2
 
 export EMQX_RELUP ?= true
 export EMQX_REL_FORM ?= tgz
diff --git a/apps/emqx/include/emqx_mqtt.hrl b/apps/emqx/include/emqx_mqtt.hrl
index 09f7495ea..1c3fd770c 100644
--- a/apps/emqx/include/emqx_mqtt.hrl
+++ b/apps/emqx/include/emqx_mqtt.hrl
@@ -683,6 +683,7 @@ end).
 
 -define(FRAME_PARSE_ERROR, frame_parse_error).
 -define(FRAME_SERIALIZE_ERROR, frame_serialize_error).
+
 -define(THROW_FRAME_ERROR(Reason), erlang:throw({?FRAME_PARSE_ERROR, Reason})).
 -define(THROW_SERIALIZE_ERROR(Reason), erlang:throw({?FRAME_SERIALIZE_ERROR, Reason})).
 
diff --git a/apps/emqx/include/emqx_release.hrl b/apps/emqx/include/emqx_release.hrl
index c8e84ea06..4357f7aef 100644
--- a/apps/emqx/include/emqx_release.hrl
+++ b/apps/emqx/include/emqx_release.hrl
@@ -32,7 +32,7 @@
 %% `apps/emqx/src/bpapi/README.md'
 
 %% Opensource edition
--define(EMQX_RELEASE_CE, "5.7.1").
+-define(EMQX_RELEASE_CE, "5.7.2").
 
 %% Enterprise edition
--define(EMQX_RELEASE_EE, "5.7.1").
+-define(EMQX_RELEASE_EE, "5.7.2").
diff --git a/apps/emqx/include/logger.hrl b/apps/emqx/include/logger.hrl
index a65b05089..885049a35 100644
--- a/apps/emqx/include/logger.hrl
+++ b/apps/emqx/include/logger.hrl
@@ -91,7 +91,7 @@
     ?_DO_TRACE(Tag, Msg, Meta),
     ?SLOG(
         Level,
-        (emqx_trace_formatter:format_meta_map(Meta))#{msg => Msg, tag => Tag},
+        (Meta)#{msg => Msg, tag => Tag},
         #{is_trace => false}
     )
 end).
diff --git a/apps/emqx/src/emqx_channel.erl b/apps/emqx/src/emqx_channel.erl
index 1e68d74d6..c2c631b0b 100644
--- a/apps/emqx/src/emqx_channel.erl
+++ b/apps/emqx/src/emqx_channel.erl
@@ -146,7 +146,9 @@
 -type replies() :: emqx_types:packet() | reply() | [reply()].
 
 -define(IS_MQTT_V5, #channel{conninfo = #{proto_ver := ?MQTT_PROTO_V5}}).
-
+-define(IS_CONNECTED_OR_REAUTHENTICATING(ConnState),
+    ((ConnState == connected) orelse (ConnState == reauthenticating))
+).
 -define(IS_COMMON_SESSION_TIMER(N),
     ((N == retry_delivery) orelse (N == expire_awaiting_rel))
 ).
@@ -337,7 +339,7 @@ take_conn_info_fields(Fields, ClientInfo, ConnInfo) ->
     | {shutdown, Reason :: term(), channel()}
     | {shutdown, Reason :: term(), replies(), channel()}.
 handle_in(?CONNECT_PACKET(), Channel = #channel{conn_state = ConnState}) when
-    ConnState =:= connected orelse ConnState =:= reauthenticating
+    ?IS_CONNECTED_OR_REAUTHENTICATING(ConnState)
 ->
     handle_out(disconnect, ?RC_PROTOCOL_ERROR, Channel);
 handle_in(?CONNECT_PACKET(), Channel = #channel{conn_state = connecting}) ->
@@ -567,29 +569,8 @@ handle_in(
     process_disconnect(ReasonCode, Properties, NChannel);
 handle_in(?AUTH_PACKET(), Channel) ->
     handle_out(disconnect, ?RC_IMPLEMENTATION_SPECIFIC_ERROR, Channel);
-handle_in({frame_error, Reason}, Channel = #channel{conn_state = idle}) ->
-    shutdown(shutdown_count(frame_error, Reason), Channel);
-handle_in(
-    {frame_error, #{cause := frame_too_large} = R}, Channel = #channel{conn_state = connecting}
-) ->
-    shutdown(
-        shutdown_count(frame_error, R), ?CONNACK_PACKET(?RC_PACKET_TOO_LARGE), Channel
-    );
-handle_in({frame_error, Reason}, Channel = #channel{conn_state = connecting}) ->
-    shutdown(shutdown_count(frame_error, Reason), ?CONNACK_PACKET(?RC_MALFORMED_PACKET), Channel);
-handle_in(
-    {frame_error, #{cause := frame_too_large}}, Channel = #channel{conn_state = ConnState}
-) when
-    ConnState =:= connected orelse ConnState =:= reauthenticating
-->
-    handle_out(disconnect, {?RC_PACKET_TOO_LARGE, frame_too_large}, Channel);
-handle_in({frame_error, Reason}, Channel = #channel{conn_state = ConnState}) when
-    ConnState =:= connected orelse ConnState =:= reauthenticating
-->
-    handle_out(disconnect, {?RC_MALFORMED_PACKET, Reason}, Channel);
-handle_in({frame_error, Reason}, Channel = #channel{conn_state = disconnected}) ->
-    ?SLOG(error, #{msg => "malformed_mqtt_message", reason => Reason}),
-    {ok, Channel};
+handle_in({frame_error, Reason}, Channel) ->
+    handle_frame_error(Reason, Channel);
 handle_in(Packet, Channel) ->
     ?SLOG(error, #{msg => "disconnecting_due_to_unexpected_message", packet => Packet}),
     handle_out(disconnect, ?RC_PROTOCOL_ERROR, Channel).
@@ -1021,6 +1002,68 @@ not_nacked({deliver, _Topic, Msg}) ->
             true
     end.
 
+%%--------------------------------------------------------------------
+%% Handle Frame Error
+%%--------------------------------------------------------------------
+
+handle_frame_error(
+    Reason = #{cause := frame_too_large},
+    Channel = #channel{conn_state = ConnState, conninfo = ConnInfo}
+) when
+    ?IS_CONNECTED_OR_REAUTHENTICATING(ConnState)
+->
+    ShutdownCount = shutdown_count(frame_error, Reason),
+    case proto_ver(Reason, ConnInfo) of
+        ?MQTT_PROTO_V5 ->
+            handle_out(disconnect, {?RC_PACKET_TOO_LARGE, frame_too_large}, Channel);
+        _ ->
+            shutdown(ShutdownCount, Channel)
+    end;
+%% Only send CONNACK with reason code `frame_too_large` for MQTT-v5.0 when connecting,
+%% otherwise DONOT send any CONNACK or DISCONNECT packet.
+handle_frame_error(
+    Reason,
+    Channel = #channel{conn_state = ConnState, conninfo = ConnInfo}
+) when
+    is_map(Reason) andalso
+        (ConnState == idle orelse ConnState == connecting)
+->
+    ShutdownCount = shutdown_count(frame_error, Reason),
+    ProtoVer = proto_ver(Reason, ConnInfo),
+    NChannel = Channel#channel{conninfo = ConnInfo#{proto_ver => ProtoVer}},
+    case ProtoVer of
+        ?MQTT_PROTO_V5 ->
+            shutdown(ShutdownCount, ?CONNACK_PACKET(?RC_PACKET_TOO_LARGE), NChannel);
+        _ ->
+            shutdown(ShutdownCount, NChannel)
+    end;
+handle_frame_error(
+    Reason,
+    Channel = #channel{conn_state = connecting}
+) ->
+    shutdown(
+        shutdown_count(frame_error, Reason),
+        ?CONNACK_PACKET(?RC_MALFORMED_PACKET),
+        Channel
+    );
+handle_frame_error(
+    Reason,
+    Channel = #channel{conn_state = ConnState}
+) when
+    ?IS_CONNECTED_OR_REAUTHENTICATING(ConnState)
+->
+    handle_out(
+        disconnect,
+        {?RC_MALFORMED_PACKET, Reason},
+        Channel
+    );
+handle_frame_error(
+    Reason,
+    Channel = #channel{conn_state = disconnected}
+) ->
+    ?SLOG(error, #{msg => "malformed_mqtt_message", reason => Reason}),
+    {ok, Channel}.
+
 %%--------------------------------------------------------------------
 %% Handle outgoing packet
 %%--------------------------------------------------------------------
@@ -1289,7 +1332,7 @@ handle_info(
             session = Session
         }
 ) when
-    ConnState =:= connected orelse ConnState =:= reauthenticating
+    ?IS_CONNECTED_OR_REAUTHENTICATING(ConnState)
 ->
     {Intent, Session1} = session_disconnect(ClientInfo, ConnInfo, Session),
     Channel1 = ensure_disconnected(Reason, maybe_publish_will_msg(sock_closed, Channel)),
@@ -2636,8 +2679,7 @@ save_alias(outbound, AliasId, Topic, TopicAliases = #{outbound := Aliases}) ->
     NAliases = maps:put(Topic, AliasId, Aliases),
     TopicAliases#{outbound => NAliases}.
 
--compile({inline, [reply/2, shutdown/2, shutdown/3, sp/1, flag/1]}).
-
+-compile({inline, [reply/2, shutdown/2, shutdown/3]}).
 reply(Reply, Channel) ->
     {reply, Reply, Channel}.
 
@@ -2673,13 +2715,13 @@ disconnect_and_shutdown(
         ?IS_MQTT_V5 =
         #channel{conn_state = ConnState}
 ) when
-    ConnState =:= connected orelse ConnState =:= reauthenticating
+    ?IS_CONNECTED_OR_REAUTHENTICATING(ConnState)
 ->
     NChannel = ensure_disconnected(Reason, Channel),
     shutdown(Reason, Reply, ?DISCONNECT_PACKET(reason_code(Reason)), NChannel);
 %% mqtt v3/v4 connected sessions
 disconnect_and_shutdown(Reason, Reply, Channel = #channel{conn_state = ConnState}) when
-    ConnState =:= connected orelse ConnState =:= reauthenticating
+    ?IS_CONNECTED_OR_REAUTHENTICATING(ConnState)
 ->
     NChannel = ensure_disconnected(Reason, Channel),
     shutdown(Reason, Reply, NChannel);
@@ -2722,6 +2764,13 @@ is_durable_session(#channel{session = Session}) ->
             false
     end.
 
+proto_ver(#{proto_ver := ProtoVer}, _ConnInfo) ->
+    ProtoVer;
+proto_ver(_Reason, #{proto_ver := ProtoVer}) ->
+    ProtoVer;
+proto_ver(_, _) ->
+    ?MQTT_PROTO_V4.
+
 %%--------------------------------------------------------------------
 %% For CT tests
 %%--------------------------------------------------------------------
diff --git a/apps/emqx/src/emqx_connection.erl b/apps/emqx/src/emqx_connection.erl
index a3c545ea6..c0801b1e3 100644
--- a/apps/emqx/src/emqx_connection.erl
+++ b/apps/emqx/src/emqx_connection.erl
@@ -783,7 +783,8 @@ parse_incoming(Data, Packets, State = #state{parse_state = ParseState}) ->
                 input_bytes => Data,
                 parsed_packets => Packets
             }),
-            {[{frame_error, Reason} | Packets], State};
+            NState = enrich_state(Reason, State),
+            {[{frame_error, Reason} | Packets], NState};
         error:Reason:Stacktrace ->
             ?LOG(error, #{
                 at_state => emqx_frame:describe_state(ParseState),
@@ -1227,6 +1228,12 @@ inc_counter(Key, Inc) ->
     _ = emqx_pd:inc_counter(Key, Inc),
     ok.
 
+enrich_state(#{parse_state := NParseState}, State) ->
+    Serialize = emqx_frame:serialize_opts(NParseState),
+    State#state{parse_state = NParseState, serialize = Serialize};
+enrich_state(_, State) ->
+    State.
+
 set_tcp_keepalive({quic, _Listener}) ->
     ok;
 set_tcp_keepalive({Type, Id}) ->
diff --git a/apps/emqx/src/emqx_frame.erl b/apps/emqx/src/emqx_frame.erl
index 41fc00f4c..0d8ec160c 100644
--- a/apps/emqx/src/emqx_frame.erl
+++ b/apps/emqx/src/emqx_frame.erl
@@ -267,28 +267,50 @@ packet(Header, Variable) ->
 packet(Header, Variable, Payload) ->
     #mqtt_packet{header = Header, variable = Variable, payload = Payload}.
 
-parse_connect(FrameBin, StrictMode) ->
-    {ProtoName, Rest} = parse_utf8_string_with_cause(FrameBin, StrictMode, invalid_proto_name),
-    case ProtoName of
-        <<"MQTT">> ->
-            ok;
-        <<"MQIsdp">> ->
-            ok;
-        _ ->
-            %% from spec: the server MAY send disconnect with reason code 0x84
-            %% we chose to close socket because the client is likely not talking MQTT anyway
-            ?PARSE_ERR(#{
-                cause => invalid_proto_name,
-                expected => <<"'MQTT' or 'MQIsdp'">>,
-                received => ProtoName
-            })
-    end,
-    parse_connect2(ProtoName, Rest, StrictMode).
+parse_connect(FrameBin, Options = #{strict_mode := StrictMode}) ->
+    {ProtoName, Rest0} = parse_utf8_string_with_cause(FrameBin, StrictMode, invalid_proto_name),
+    %% No need to parse and check proto_ver if proto_name is invalid, check it first
+    %% And the matching check of `proto_name` and `proto_ver` fields will be done in `emqx_packet:check_proto_ver/2`
+    _ = validate_proto_name(ProtoName),
+    {IsBridge, ProtoVer, Rest2} = parse_connect_proto_ver(Rest0),
+    NOptions = Options#{version => ProtoVer},
+    try
+        do_parse_connect(ProtoName, IsBridge, ProtoVer, Rest2, StrictMode)
+    catch
+        throw:{?FRAME_PARSE_ERROR, ReasonM} when is_map(ReasonM) ->
+            ?PARSE_ERR(
+                ReasonM#{
+                    proto_ver => ProtoVer,
+                    proto_name => ProtoName,
+                    parse_state => ?NONE(NOptions)
+                }
+            );
+        throw:{?FRAME_PARSE_ERROR, Reason} ->
+            ?PARSE_ERR(
+                #{
+                    cause => Reason,
+                    proto_ver => ProtoVer,
+                    proto_name => ProtoName,
+                    parse_state => ?NONE(NOptions)
+                }
+            )
+    end.
 
-parse_connect2(
+do_parse_connect(
     ProtoName,
-    <<BridgeTag:4, ProtoVer:4, UsernameFlagB:1, PasswordFlagB:1, WillRetainB:1, WillQoS:2,
-        WillFlagB:1, CleanStart:1, Reserved:1, KeepAlive:16/big, Rest2/binary>>,
+    IsBridge,
+    ProtoVer,
+    <<
+        UsernameFlagB:1,
+        PasswordFlagB:1,
+        WillRetainB:1,
+        WillQoS:2,
+        WillFlagB:1,
+        CleanStart:1,
+        Reserved:1,
+        KeepAlive:16/big,
+        Rest/binary
+    >>,
     StrictMode
 ) ->
     _ = validate_connect_reserved(Reserved),
@@ -303,14 +325,14 @@ parse_connect2(
         UsernameFlag = bool(UsernameFlagB),
         PasswordFlag = bool(PasswordFlagB)
     ),
-    {Properties, Rest3} = parse_properties(Rest2, ProtoVer, StrictMode),
+    {Properties, Rest3} = parse_properties(Rest, ProtoVer, StrictMode),
     {ClientId, Rest4} = parse_utf8_string_with_cause(Rest3, StrictMode, invalid_clientid),
     ConnPacket = #mqtt_packet_connect{
         proto_name = ProtoName,
         proto_ver = ProtoVer,
         %% For bridge mode, non-standard implementation
         %% Invented by mosquitto, named 'try_private': https://mosquitto.org/man/mosquitto-conf-5.html
-        is_bridge = (BridgeTag =:= 8),
+        is_bridge = IsBridge,
         clean_start = bool(CleanStart),
         will_flag = WillFlag,
         will_qos = WillQoS,
@@ -343,16 +365,16 @@ parse_connect2(
                 unexpected_trailing_bytes => size(Rest7)
             })
     end;
-parse_connect2(_ProtoName, Bin, _StrictMode) ->
-    %% sent less than 32 bytes
+do_parse_connect(_ProtoName, _IsBridge, _ProtoVer, Bin, _StrictMode) ->
+    %% sent less than 24 bytes
     ?PARSE_ERR(#{cause => malformed_connect, header_bytes => Bin}).
 
 parse_packet(
     #mqtt_packet_header{type = ?CONNECT},
     FrameBin,
-    #{strict_mode := StrictMode}
+    Options
 ) ->
-    parse_connect(FrameBin, StrictMode);
+    parse_connect(FrameBin, Options);
 parse_packet(
     #mqtt_packet_header{type = ?CONNACK},
     <<AckFlags:8, ReasonCode:8, Rest/binary>>,
@@ -516,6 +538,12 @@ parse_packet_id(<<PacketId:16/big, Rest/binary>>) ->
 parse_packet_id(_) ->
     ?PARSE_ERR(invalid_packet_id).
 
+parse_connect_proto_ver(<<BridgeTag:4, ProtoVer:4, Rest/binary>>) ->
+    {_IsBridge = (BridgeTag =:= 8), ProtoVer, Rest};
+parse_connect_proto_ver(Bin) ->
+    %% sent less than 1 bytes or empty
+    ?PARSE_ERR(#{cause => malformed_connect, header_bytes => Bin}).
+
 parse_properties(Bin, Ver, _StrictMode) when Ver =/= ?MQTT_PROTO_V5 ->
     {#{}, Bin};
 %% TODO: version mess?
@@ -739,6 +767,8 @@ serialize_fun(#{version := Ver, max_size := MaxSize, strict_mode := StrictMode})
 initial_serialize_opts(Opts) ->
     maps:merge(?DEFAULT_OPTIONS, Opts).
 
+serialize_opts(?NONE(Options)) ->
+    maps:merge(?DEFAULT_OPTIONS, Options);
 serialize_opts(#mqtt_packet_connect{proto_ver = ProtoVer, properties = ConnProps}) ->
     MaxSize = get_property('Maximum-Packet-Size', ConnProps, ?MAX_PACKET_SIZE),
     #{version => ProtoVer, max_size => MaxSize, strict_mode => false}.
@@ -1157,18 +1187,34 @@ validate_subqos([3 | _]) -> ?PARSE_ERR(bad_subqos);
 validate_subqos([_ | T]) -> validate_subqos(T);
 validate_subqos([]) -> ok.
 
+%% from spec: the server MAY send disconnect with reason code 0x84
+%% we chose to close socket because the client is likely not talking MQTT anyway
+validate_proto_name(<<"MQTT">>) ->
+    ok;
+validate_proto_name(<<"MQIsdp">>) ->
+    ok;
+validate_proto_name(ProtoName) ->
+    ?PARSE_ERR(#{
+        cause => invalid_proto_name,
+        expected => <<"'MQTT' or 'MQIsdp'">>,
+        received => ProtoName
+    }).
+
 %% MQTT-v3.1.1-[MQTT-3.1.2-3], MQTT-v5.0-[MQTT-3.1.2-3]
+-compile({inline, [validate_connect_reserved/1]}).
 validate_connect_reserved(0) -> ok;
 validate_connect_reserved(1) -> ?PARSE_ERR(reserved_connect_flag).
 
+-compile({inline, [validate_connect_will/3]}).
 %% MQTT-v3.1.1-[MQTT-3.1.2-13], MQTT-v5.0-[MQTT-3.1.2-11]
-validate_connect_will(false, _, WillQos) when WillQos > 0 -> ?PARSE_ERR(invalid_will_qos);
+validate_connect_will(false, _, WillQoS) when WillQoS > 0 -> ?PARSE_ERR(invalid_will_qos);
 %% MQTT-v3.1.1-[MQTT-3.1.2-14], MQTT-v5.0-[MQTT-3.1.2-12]
 validate_connect_will(true, _, WillQoS) when WillQoS > 2 -> ?PARSE_ERR(invalid_will_qos);
 %% MQTT-v3.1.1-[MQTT-3.1.2-15], MQTT-v5.0-[MQTT-3.1.2-13]
 validate_connect_will(false, WillRetain, _) when WillRetain -> ?PARSE_ERR(invalid_will_retain);
 validate_connect_will(_, _, _) -> ok.
 
+-compile({inline, [validate_connect_password_flag/4]}).
 %% MQTT-v3.1
 %% Username flag and password flag are not strongly related
 %% https://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#connect
@@ -1183,6 +1229,7 @@ validate_connect_password_flag(true, ?MQTT_PROTO_V5, _, _) ->
 validate_connect_password_flag(_, _, _, _) ->
     ok.
 
+-compile({inline, [bool/1]}).
 bool(0) -> false;
 bool(1) -> true.
 
diff --git a/apps/emqx/src/emqx_listeners.erl b/apps/emqx/src/emqx_listeners.erl
index ba50b3630..87fecffd4 100644
--- a/apps/emqx/src/emqx_listeners.erl
+++ b/apps/emqx/src/emqx_listeners.erl
@@ -432,7 +432,7 @@ do_start_listener(Type, Name, Id, #{bind := ListenOn} = Opts) when ?ESOCKD_LISTE
     esockd:open(
         Id,
         ListenOn,
-        merge_default(esockd_opts(Id, Type, Name, Opts))
+        merge_default(esockd_opts(Id, Type, Name, Opts, _OldOpts = undefined))
     );
 %% Start MQTT/WS listener
 do_start_listener(Type, Name, Id, Opts) when ?COWBOY_LISTENER(Type) ->
@@ -476,7 +476,7 @@ do_update_listener(Type, Name, OldConf, NewConf = #{bind := ListenOn}) when
     Id = listener_id(Type, Name),
     case maps:get(bind, OldConf) of
         ListenOn ->
-            esockd:set_options({Id, ListenOn}, esockd_opts(Id, Type, Name, NewConf));
+            esockd:set_options({Id, ListenOn}, esockd_opts(Id, Type, Name, NewConf, OldConf));
         _Different ->
             %% TODO
             %% Again, we're not strictly required to drop live connections in this case.
@@ -588,7 +588,7 @@ perform_listener_change(update, {{Type, Name, ConfOld}, {_, _, ConfNew}}) ->
 perform_listener_change(stop, {Type, Name, Conf}) ->
     stop_listener(Type, Name, Conf).
 
-esockd_opts(ListenerId, Type, Name, Opts0) ->
+esockd_opts(ListenerId, Type, Name, Opts0, OldOpts) ->
     Opts1 = maps:with([acceptors, max_connections, proxy_protocol, proxy_protocol_timeout], Opts0),
     Limiter = limiter(Opts0),
     Opts2 =
@@ -620,7 +620,7 @@ esockd_opts(ListenerId, Type, Name, Opts0) ->
             tcp ->
                 Opts3#{tcp_options => tcp_opts(Opts0)};
             ssl ->
-                OptsWithCRL = inject_crl_config(Opts0),
+                OptsWithCRL = inject_crl_config(Opts0, OldOpts),
                 OptsWithSNI = inject_sni_fun(ListenerId, OptsWithCRL),
                 OptsWithRootFun = inject_root_fun(OptsWithSNI),
                 OptsWithVerifyFun = inject_verify_fun(OptsWithRootFun),
@@ -996,7 +996,7 @@ inject_sni_fun(_ListenerId, Conf) ->
     Conf.
 
 inject_crl_config(
-    Conf = #{ssl_options := #{enable_crl_check := true} = SSLOpts}
+    Conf = #{ssl_options := #{enable_crl_check := true} = SSLOpts}, _OldOpts
 ) ->
     HTTPTimeout = emqx_config:get([crl_cache, http_timeout], timer:seconds(15)),
     Conf#{
@@ -1006,7 +1006,16 @@ inject_crl_config(
             crl_cache => {emqx_ssl_crl_cache, {internal, [{http, HTTPTimeout}]}}
         }
     };
-inject_crl_config(Conf) ->
+inject_crl_config(#{ssl_options := SSLOpts0} = Conf0, #{} = OldOpts) ->
+    %% Note: we must set crl options to `undefined' to unset them.  Otherwise,
+    %% `esockd' will retain such options when `esockd:merge_opts/2' is called and the SSL
+    %% options were previously enabled.
+    WasEnabled = emqx_utils_maps:deep_get([ssl_options, enable_crl_check], OldOpts, false),
+    Undefine = fun(Acc, K) -> emqx_utils_maps:put_if(Acc, K, undefined, WasEnabled) end,
+    SSLOpts1 = Undefine(SSLOpts0, crl_check),
+    SSLOpts = Undefine(SSLOpts1, crl_cache),
+    Conf0#{ssl_options := SSLOpts};
+inject_crl_config(Conf, undefined = _OldOpts) ->
     Conf.
 
 maybe_unregister_ocsp_stapling_refresh(
diff --git a/apps/emqx/src/emqx_logger_jsonfmt.erl b/apps/emqx/src/emqx_logger_jsonfmt.erl
index 515b2114a..fade19112 100644
--- a/apps/emqx/src/emqx_logger_jsonfmt.erl
+++ b/apps/emqx/src/emqx_logger_jsonfmt.erl
@@ -105,7 +105,7 @@ format(Msg, Meta, Config) ->
 maybe_format_msg(undefined, _Meta, _Config) ->
     #{};
 maybe_format_msg({report, Report0} = Msg, #{report_cb := Cb} = Meta, Config) ->
-    Report = emqx_logger_textfmt:try_encode_payload(Report0, Config),
+    Report = emqx_logger_textfmt:try_encode_meta(Report0, Config),
     case is_map(Report) andalso Cb =:= ?DEFAULT_FORMATTER of
         true ->
             %% reporting a map without a customised format function
diff --git a/apps/emqx/src/emqx_logger_textfmt.erl b/apps/emqx/src/emqx_logger_textfmt.erl
index b7cc64510..0c6223f8d 100644
--- a/apps/emqx/src/emqx_logger_textfmt.erl
+++ b/apps/emqx/src/emqx_logger_textfmt.erl
@@ -20,7 +20,7 @@
 
 -export([format/2]).
 -export([check_config/1]).
--export([try_format_unicode/1, try_encode_payload/2]).
+-export([try_format_unicode/1, try_encode_meta/2]).
 %% Used in the other log formatters
 -export([evaluate_lazy_values_if_dbg_level/1, evaluate_lazy_values/1]).
 
@@ -111,7 +111,7 @@ is_list_report_acceptable(_) ->
 enrich_report(ReportRaw0, Meta, Config) ->
     %% clientid and peername always in emqx_conn's process metadata.
     %% topic and username can be put in meta using ?SLOG/3, or put in msg's report by ?SLOG/2
-    ReportRaw = try_encode_payload(ReportRaw0, Config),
+    ReportRaw = try_encode_meta(ReportRaw0, Config),
     Topic =
         case maps:get(topic, Meta, undefined) of
             undefined -> maps:get(topic, ReportRaw, undefined);
@@ -180,9 +180,22 @@ enrich_topic({Fmt, Args}, #{topic := Topic}) when is_list(Fmt) ->
 enrich_topic(Msg, _) ->
     Msg.
 
-try_encode_payload(#{payload := Payload} = Report, #{payload_encode := Encode}) ->
+try_encode_meta(Report, Config) ->
+    lists:foldl(
+        fun(Meta, Acc) ->
+            try_encode_meta(Meta, Acc, Config)
+        end,
+        Report,
+        [payload, packet]
+    ).
+
+try_encode_meta(payload, #{payload := Payload} = Report, #{payload_encode := Encode}) ->
     Report#{payload := encode_payload(Payload, Encode)};
-try_encode_payload(Report, _Config) ->
+try_encode_meta(packet, #{packet := Packet} = Report, #{payload_encode := Encode}) when
+    is_tuple(Packet)
+->
+    Report#{packet := emqx_packet:format(Packet, Encode)};
+try_encode_meta(_, Report, _Config) ->
     Report.
 
 encode_payload(Payload, text) ->
@@ -190,4 +203,5 @@ encode_payload(Payload, text) ->
 encode_payload(_Payload, hidden) ->
     "******";
 encode_payload(Payload, hex) ->
-    binary:encode_hex(Payload).
+    Bin = emqx_utils_conv:bin(Payload),
+    binary:encode_hex(Bin).
diff --git a/apps/emqx/src/emqx_packet.erl b/apps/emqx/src/emqx_packet.erl
index 9d6516126..6f5fa0972 100644
--- a/apps/emqx/src/emqx_packet.erl
+++ b/apps/emqx/src/emqx_packet.erl
@@ -51,7 +51,6 @@
 ]).
 
 -export([
-    format/1,
     format/2
 ]).
 
@@ -481,10 +480,6 @@ will_msg(#mqtt_packet_connect{
         headers = #{username => Username, properties => Props}
     }.
 
-%% @doc Format packet
--spec format(emqx_types:packet()) -> iolist().
-format(Packet) -> format(Packet, emqx_trace_handler:payload_encode()).
-
 %% @doc Format packet
 -spec format(emqx_types:packet(), hex | text | hidden) -> iolist().
 format(#mqtt_packet{header = Header, variable = Variable, payload = Payload}, PayloadEncode) ->
diff --git a/apps/emqx/src/emqx_quic_connection.erl b/apps/emqx/src/emqx_quic_connection.erl
index df9520d90..c63014cea 100644
--- a/apps/emqx/src/emqx_quic_connection.erl
+++ b/apps/emqx/src/emqx_quic_connection.erl
@@ -62,7 +62,7 @@
     streams := [{pid(), quicer:stream_handle()}],
     %% New stream opts
     stream_opts := map(),
-    %% If conneciton is resumed from session ticket
+    %% If connection is resumed from session ticket
     is_resumed => boolean(),
     %% mqtt message serializer config
     serialize => undefined,
@@ -70,8 +70,8 @@
 }.
 -type cb_ret() :: quicer_lib:cb_ret().
 
-%% @doc  Data streams initializions are started in parallel with control streams, data streams are blocked
-%%       for the activation from control stream after it is accepted as a legit conneciton.
+%% @doc  Data streams initializations are started in parallel with control streams, data streams are blocked
+%%       for the activation from control stream after it is accepted as a legit connection.
 %%       For security, the initial number of allowed data streams from client should be limited by
 %%       'peer_bidi_stream_count` & 'peer_unidi_stream_count`
 -spec activate_data_streams(pid(), {
@@ -80,7 +80,7 @@
 activate_data_streams(ConnOwner, {PS, Serialize, Channel}) ->
     gen_server:call(ConnOwner, {activate_data_streams, {PS, Serialize, Channel}}, infinity).
 
-%% @doc conneciton owner init callback
+%% @doc connection owner init callback
 -spec init(map()) -> {ok, cb_state()}.
 init(#{stream_opts := SOpts} = S) when is_list(SOpts) ->
     init(S#{stream_opts := maps:from_list(SOpts)});
diff --git a/apps/emqx/src/emqx_tls_lib.erl b/apps/emqx/src/emqx_tls_lib.erl
index e1de50385..1b9e89199 100644
--- a/apps/emqx/src/emqx_tls_lib.erl
+++ b/apps/emqx/src/emqx_tls_lib.erl
@@ -589,6 +589,14 @@ ensure_valid_options(Options, Versions) ->
 
 ensure_valid_options([], _, Acc) ->
     lists:reverse(Acc);
+ensure_valid_options([{K, undefined} | T], Versions, Acc) when
+    K =:= crl_check;
+    K =:= crl_cache
+->
+    %% Note: we must set crl options to `undefined' to unset them.  Otherwise,
+    %% `esockd' will retain such options when `esockd:merge_opts/2' is called and the SSL
+    %% options were previously enabled.
+    ensure_valid_options(T, Versions, [{K, undefined} | Acc]);
 ensure_valid_options([{_, undefined} | T], Versions, Acc) ->
     ensure_valid_options(T, Versions, Acc);
 ensure_valid_options([{_, ""} | T], Versions, Acc) ->
diff --git a/apps/emqx/src/emqx_trace/emqx_trace_formatter.erl b/apps/emqx/src/emqx_trace/emqx_trace_formatter.erl
index e540ae82a..728280700 100644
--- a/apps/emqx/src/emqx_trace/emqx_trace_formatter.erl
+++ b/apps/emqx/src/emqx_trace/emqx_trace_formatter.erl
@@ -17,7 +17,6 @@
 -include("emqx_mqtt.hrl").
 
 -export([format/2]).
--export([format_meta_map/1]).
 
 %% logger_formatter:config/0 is not exported.
 -type config() :: map().
@@ -43,10 +42,6 @@ format(
 format(Event, Config) ->
     emqx_logger_textfmt:format(Event, Config).
 
-format_meta_map(Meta) ->
-    Encode = emqx_trace_handler:payload_encode(),
-    format_meta_map(Meta, Encode).
-
 format_meta_map(Meta, Encode) ->
     format_meta_map(Meta, Encode, [
         {packet, fun format_packet/2},
diff --git a/apps/emqx/src/emqx_ws_connection.erl b/apps/emqx/src/emqx_ws_connection.erl
index 1fa7433b1..bb9756a5c 100644
--- a/apps/emqx/src/emqx_ws_connection.erl
+++ b/apps/emqx/src/emqx_ws_connection.erl
@@ -436,6 +436,7 @@ websocket_handle({Frame, _}, State) ->
     %% TODO: should not close the ws connection
     ?LOG(error, #{msg => "unexpected_frame", frame => Frame}),
     shutdown(unexpected_ws_frame, State).
+
 websocket_info({call, From, Req}, State) ->
     handle_call(From, Req, State);
 websocket_info({cast, rate_limit}, State) ->
@@ -737,7 +738,8 @@ parse_incoming(Data, Packets, State = #state{parse_state = ParseState}) ->
                 input_bytes => Data
             }),
             FrameError = {frame_error, Reason},
-            {[{incoming, FrameError} | Packets], State};
+            NState = enrich_state(Reason, State),
+            {[{incoming, FrameError} | Packets], NState};
         error:Reason:Stacktrace ->
             ?LOG(error, #{
                 at_state => emqx_frame:describe_state(ParseState),
@@ -830,7 +832,7 @@ serialize_and_inc_stats_fun(#state{serialize = Serialize}) ->
                 ?LOG(warning, #{
                     msg => "packet_discarded",
                     reason => "frame_too_large",
-                    packet => emqx_packet:format(Packet)
+                    packet => Packet
                 }),
                 ok = emqx_metrics:inc('delivery.dropped.too_large'),
                 ok = emqx_metrics:inc('delivery.dropped'),
@@ -1069,6 +1071,13 @@ check_max_connection(Type, Listener) ->
                     {denny, Reason}
             end
     end.
+
+enrich_state(#{parse_state := NParseState}, State) ->
+    Serialize = emqx_frame:serialize_opts(NParseState),
+    State#state{parse_state = NParseState, serialize = Serialize};
+enrich_state(_, State) ->
+    State.
+
 %%--------------------------------------------------------------------
 %% For CT tests
 %%--------------------------------------------------------------------
diff --git a/apps/emqx/test/emqx_channel_SUITE.erl b/apps/emqx/test/emqx_channel_SUITE.erl
index d157cc914..83b862892 100644
--- a/apps/emqx/test/emqx_channel_SUITE.erl
+++ b/apps/emqx/test/emqx_channel_SUITE.erl
@@ -414,24 +414,32 @@ t_handle_in_auth(_) ->
         emqx_channel:handle_in(?AUTH_PACKET(), Channel).
 
 t_handle_in_frame_error(_) ->
-    IdleChannel = channel(#{conn_state => idle}),
-    {shutdown, #{shutdown_count := frame_too_large, cause := frame_too_large}, _Chan} =
-        emqx_channel:handle_in({frame_error, #{cause => frame_too_large}}, IdleChannel),
+    IdleChannelV5 = channel(#{conn_state => idle}),
+    %% no CONNACK packet for v4
+    ?assertMatch(
+        {shutdown, #{shutdown_count := frame_too_large, cause := frame_too_large}, _Chan},
+        emqx_channel:handle_in(
+            {frame_error, #{cause => frame_too_large}}, v4(IdleChannelV5)
+        )
+    ),
+
     ConnectingChan = channel(#{conn_state => connecting}),
     ConnackPacket = ?CONNACK_PACKET(?RC_PACKET_TOO_LARGE),
-    {shutdown,
-        #{
-            shutdown_count := frame_too_large,
-            cause := frame_too_large,
-            limit := 100,
-            received := 101
-        },
-        ConnackPacket,
-        _} =
+    ?assertMatch(
+        {shutdown,
+            #{
+                shutdown_count := frame_too_large,
+                cause := frame_too_large,
+                limit := 100,
+                received := 101
+            },
+            ConnackPacket, _},
         emqx_channel:handle_in(
             {frame_error, #{cause => frame_too_large, received => 101, limit => 100}},
             ConnectingChan
-        ),
+        )
+    ),
+
     DisconnectPacket = ?DISCONNECT_PACKET(?RC_PACKET_TOO_LARGE),
     ConnectedChan = channel(#{conn_state => connected}),
     ?assertMatch(
diff --git a/apps/emqx/test/emqx_crl_cache_SUITE.erl b/apps/emqx/test/emqx_crl_cache_SUITE.erl
index 1d7d0f1d5..51196439e 100644
--- a/apps/emqx/test/emqx_crl_cache_SUITE.erl
+++ b/apps/emqx/test/emqx_crl_cache_SUITE.erl
@@ -138,13 +138,14 @@ init_per_testcase(t_refresh_config = TestCase, Config) ->
     ];
 init_per_testcase(TestCase, Config) when
     TestCase =:= t_update_listener;
+    TestCase =:= t_update_listener_enable_disable;
     TestCase =:= t_validations
 ->
     ct:timetrap({seconds, 30}),
     ok = snabbkaffe:start_trace(),
     %% when running emqx standalone tests, we can't use those
     %% features.
-    case does_module_exist(emqx_management) of
+    case does_module_exist(emqx_mgmt) of
         true ->
             DataDir = ?config(data_dir, Config),
             CRLFile = filename:join([DataDir, "intermediate-revoked.crl.pem"]),
@@ -165,7 +166,7 @@ init_per_testcase(TestCase, Config) when
                     {emqx_conf, #{config => #{listeners => #{ssl => #{default => ListenerConf}}}}},
                     emqx,
                     emqx_management,
-                    {emqx_dashboard, "dashboard.listeners.http { enable = true, bind = 18083 }"}
+                    emqx_mgmt_api_test_util:emqx_dashboard()
                 ],
                 #{work_dir => emqx_cth_suite:work_dir(TestCase, Config)}
             ),
@@ -206,6 +207,7 @@ read_crl(Filename) ->
 
 end_per_testcase(TestCase, Config) when
     TestCase =:= t_update_listener;
+    TestCase =:= t_update_listener_enable_disable;
     TestCase =:= t_validations
 ->
     Skip = proplists:get_bool(skip_does_not_apply, Config),
@@ -1057,3 +1059,104 @@ do_t_validations(_Config) ->
     ),
 
     ok.
+
+%% Checks that if CRL is ever enabled and then disabled, clients can connect, even if they
+%% would otherwise not have their corresponding CRLs cached and fail with `{bad_crls,
+%% no_relevant_crls}`.
+t_update_listener_enable_disable(Config) ->
+    case proplists:get_bool(skip_does_not_apply, Config) of
+        true ->
+            ct:pal("skipping as this test does not apply in this profile"),
+            ok;
+        false ->
+            do_t_update_listener_enable_disable(Config)
+    end.
+
+do_t_update_listener_enable_disable(Config) ->
+    DataDir = ?config(data_dir, Config),
+    Keyfile = filename:join([DataDir, "server.key.pem"]),
+    Certfile = filename:join([DataDir, "server.cert.pem"]),
+    Cacertfile = filename:join([DataDir, "ca-chain.cert.pem"]),
+    ClientCert = filename:join(DataDir, "client.cert.pem"),
+    ClientKey = filename:join(DataDir, "client.key.pem"),
+
+    ListenerId = "ssl:default",
+    %% Enable CRL
+    {ok, {{_, 200, _}, _, ListenerData0}} = get_listener_via_api(ListenerId),
+    CRLConfig0 =
+        #{
+            <<"ssl_options">> =>
+                #{
+                    <<"keyfile">> => Keyfile,
+                    <<"certfile">> => Certfile,
+                    <<"cacertfile">> => Cacertfile,
+                    <<"enable_crl_check">> => true,
+                    <<"fail_if_no_peer_cert">> => true
+                }
+        },
+    ListenerData1 = emqx_utils_maps:deep_merge(ListenerData0, CRLConfig0),
+    {ok, {_, _, ListenerData2}} = update_listener_via_api(ListenerId, ListenerData1),
+    ?assertMatch(
+        #{
+            <<"ssl_options">> :=
+                #{
+                    <<"enable_crl_check">> := true,
+                    <<"verify">> := <<"verify_peer">>,
+                    <<"fail_if_no_peer_cert">> := true
+                }
+        },
+        ListenerData2
+    ),
+
+    %% Disable CRL
+    CRLConfig1 =
+        #{
+            <<"ssl_options">> =>
+                #{
+                    <<"keyfile">> => Keyfile,
+                    <<"certfile">> => Certfile,
+                    <<"cacertfile">> => Cacertfile,
+                    <<"enable_crl_check">> => false,
+                    <<"fail_if_no_peer_cert">> => true
+                }
+        },
+    ListenerData3 = emqx_utils_maps:deep_merge(ListenerData2, CRLConfig1),
+    redbug:start(
+        [
+            "esockd_server:get_listener_prop -> return",
+            "esockd_server:set_listener_prop -> return",
+            "esockd:merge_opts -> return",
+            "esockd_listener_sup:set_options -> return",
+            "emqx_listeners:inject_crl_config -> return"
+        ],
+        [{msgs, 100}]
+    ),
+    {ok, {_, _, ListenerData4}} = update_listener_via_api(ListenerId, ListenerData3),
+    ?assertMatch(
+        #{
+            <<"ssl_options">> :=
+                #{
+                    <<"enable_crl_check">> := false,
+                    <<"verify">> := <<"verify_peer">>,
+                    <<"fail_if_no_peer_cert">> := true
+                }
+        },
+        ListenerData4
+    ),
+
+    %% Now the client that would be blocked tries to connect and should now be allowed.
+    {ok, C} = emqtt:start_link([
+        {ssl, true},
+        {ssl_opts, [
+            {certfile, ClientCert},
+            {keyfile, ClientKey},
+            {verify, verify_none}
+        ]},
+        {port, 8883}
+    ]),
+    ?assertMatch({ok, _}, emqtt:connect(C)),
+    emqtt:stop(C),
+
+    ?assertNotReceive({http_get, _}),
+
+    ok.
diff --git a/apps/emqx/test/emqx_frame_SUITE.erl b/apps/emqx/test/emqx_frame_SUITE.erl
index 9c8a99547..0c5a36231 100644
--- a/apps/emqx/test/emqx_frame_SUITE.erl
+++ b/apps/emqx/test/emqx_frame_SUITE.erl
@@ -63,6 +63,7 @@ groups() ->
             t_parse_malformed_properties,
             t_malformed_connect_header,
             t_malformed_connect_data,
+            t_malformed_connect_data_proto_ver,
             t_reserved_connect_flag,
             t_invalid_clientid,
             t_undefined_password,
@@ -167,6 +168,8 @@ t_parse_malformed_utf8_string(_) ->
     ParseState = emqx_frame:initial_parse_state(#{strict_mode => true}),
     ?ASSERT_FRAME_THROW(utf8_string_invalid, emqx_frame:parse(MalformedPacket, ParseState)).
 
+%% TODO: parse v3 with 0 length clientid
+
 t_serialize_parse_v3_connect(_) ->
     Bin =
         <<16, 37, 0, 6, 77, 81, 73, 115, 100, 112, 3, 2, 0, 60, 0, 23, 109, 111, 115, 113, 112, 117,
@@ -324,7 +327,7 @@ t_serialize_parse_bridge_connect(_) ->
         header = #mqtt_packet_header{type = ?CONNECT},
         variable = #mqtt_packet_connect{
             clientid = <<"C_00:0C:29:2B:77:52">>,
-            proto_ver = 16#03,
+            proto_ver = ?MQTT_PROTO_V3,
             proto_name = <<"MQIsdp">>,
             is_bridge = true,
             will_retain = true,
@@ -686,15 +689,36 @@ t_malformed_connect_header(_) ->
     ).
 
 t_malformed_connect_data(_) ->
+    ProtoNameWithLen = <<0, 6, "MQIsdp">>,
+    ConnectFlags = <<2#00000000>>,
+    ClientIdwithLen = <<0, 1, "a">>,
+    UnexpectedRestBin = <<0, 1, 2>>,
     ?ASSERT_FRAME_THROW(
-        #{cause := malformed_connect, unexpected_trailing_bytes := _},
-        emqx_frame:parse(<<16, 15, 0, 6, 77, 81, 73, 115, 100, 112, 3, 0, 0, 0, 0, 0, 0>>)
+        #{cause := malformed_connect, unexpected_trailing_bytes := 3},
+        emqx_frame:parse(
+            <<16, 18, ProtoNameWithLen/binary, ?MQTT_PROTO_V3, ConnectFlags/binary, 0, 0,
+                ClientIdwithLen/binary, UnexpectedRestBin/binary>>
+        )
+    ).
+
+t_malformed_connect_data_proto_ver(_) ->
+    Proto3NameWithLen = <<0, 6, "MQIsdp">>,
+    ?ASSERT_FRAME_THROW(
+        #{cause := malformed_connect, header_bytes := <<>>},
+        emqx_frame:parse(<<16, 8, Proto3NameWithLen/binary>>)
+    ),
+    ProtoNameWithLen = <<0, 4, "MQTT">>,
+    ?ASSERT_FRAME_THROW(
+        #{cause := malformed_connect, header_bytes := <<>>},
+        emqx_frame:parse(<<16, 6, ProtoNameWithLen/binary>>)
     ).
 
 t_reserved_connect_flag(_) ->
     ?assertException(
         throw,
-        {frame_parse_error, reserved_connect_flag},
+        {frame_parse_error, #{
+            cause := reserved_connect_flag, proto_ver := ?MQTT_PROTO_V3, proto_name := <<"MQIsdp">>
+        }},
         emqx_frame:parse(<<16, 15, 0, 6, 77, 81, 73, 115, 100, 112, 3, 1, 0, 0, 1, 0, 0>>)
     ).
 
@@ -726,7 +750,7 @@ t_undefined_password(_) ->
             },
             variable = #mqtt_packet_connect{
                 proto_name = <<"MQTT">>,
-                proto_ver = 4,
+                proto_ver = ?MQTT_PROTO_V4,
                 is_bridge = false,
                 clean_start = true,
                 will_flag = false,
@@ -774,7 +798,9 @@ t_invalid_will_retain(_) ->
             54, 75, 78, 112, 57, 0, 6, 68, 103, 55, 87, 87, 87>>,
     ?assertException(
         throw,
-        {frame_parse_error, invalid_will_retain},
+        {frame_parse_error, #{
+            cause := invalid_will_retain, proto_ver := ?MQTT_PROTO_V5, proto_name := <<"MQTT">>
+        }},
         emqx_frame:parse(ConnectBin)
     ),
     ok.
@@ -796,22 +822,30 @@ t_invalid_will_qos(_) ->
     ),
     ?assertException(
         throw,
-        {frame_parse_error, invalid_will_qos},
+        {frame_parse_error, #{
+            cause := invalid_will_qos, proto_ver := ?MQTT_PROTO_V5, proto_name := <<"MQTT">>
+        }},
         emqx_frame:parse(ConnectBinFun(Will_F_WillQoS1))
     ),
     ?assertException(
         throw,
-        {frame_parse_error, invalid_will_qos},
+        {frame_parse_error, #{
+            cause := invalid_will_qos, proto_ver := ?MQTT_PROTO_V5, proto_name := <<"MQTT">>
+        }},
         emqx_frame:parse(ConnectBinFun(Will_F_WillQoS2))
     ),
     ?assertException(
         throw,
-        {frame_parse_error, invalid_will_qos},
+        {frame_parse_error, #{
+            cause := invalid_will_qos, proto_ver := ?MQTT_PROTO_V5, proto_name := <<"MQTT">>
+        }},
         emqx_frame:parse(ConnectBinFun(Will_F_WillQoS3))
     ),
     ?assertException(
         throw,
-        {frame_parse_error, invalid_will_qos},
+        {frame_parse_error, #{
+            cause := invalid_will_qos, proto_ver := ?MQTT_PROTO_V5, proto_name := <<"MQTT">>
+        }},
         emqx_frame:parse(ConnectBinFun(Will_T_WillQoS3))
     ),
     ok.
diff --git a/apps/emqx/test/emqx_packet_SUITE.erl b/apps/emqx/test/emqx_packet_SUITE.erl
index 4ba6d1d82..04ad53a1e 100644
--- a/apps/emqx/test/emqx_packet_SUITE.erl
+++ b/apps/emqx/test/emqx_packet_SUITE.erl
@@ -377,42 +377,60 @@ t_will_msg(_) ->
 
 t_format(_) ->
     io:format("~ts", [
-        emqx_packet:format(#mqtt_packet{
-            header = #mqtt_packet_header{type = ?CONNACK, retain = true, dup = 0},
-            variable = undefined
-        })
-    ]),
-    io:format("~ts", [
-        emqx_packet:format(#mqtt_packet{
-            header = #mqtt_packet_header{type = ?CONNACK}, variable = 1, payload = <<"payload">>
-        })
+        emqx_packet:format(
+            #mqtt_packet{
+                header = #mqtt_packet_header{type = ?CONNACK, retain = true, dup = 0},
+                variable = undefined
+            },
+            text
+        )
     ]),
+    io:format(
+        "~ts",
+        [
+            emqx_packet:format(
+                #mqtt_packet{
+                    header = #mqtt_packet_header{type = ?CONNACK},
+                    variable = 1,
+                    payload = <<"payload">>
+                },
+                text
+            )
+        ]
+    ),
     io:format("~ts", [
         emqx_packet:format(
-            ?CONNECT_PACKET(#mqtt_packet_connect{
-                will_flag = true,
-                will_retain = true,
-                will_qos = ?QOS_2,
-                will_topic = <<"topic">>,
-                will_payload = <<"payload">>
-            })
+            ?CONNECT_PACKET(
+                #mqtt_packet_connect{
+                    will_flag = true,
+                    will_retain = true,
+                    will_qos = ?QOS_2,
+                    will_topic = <<"topic">>,
+                    will_payload = <<"payload">>
+                }
+            ),
+            text
         )
     ]),
     io:format("~ts", [
-        emqx_packet:format(?CONNECT_PACKET(#mqtt_packet_connect{password = password}))
+        emqx_packet:format(?CONNECT_PACKET(#mqtt_packet_connect{password = password}), text)
     ]),
-    io:format("~ts", [emqx_packet:format(?CONNACK_PACKET(?CONNACK_SERVER))]),
-    io:format("~ts", [emqx_packet:format(?PUBLISH_PACKET(?QOS_1, 1))]),
-    io:format("~ts", [emqx_packet:format(?PUBLISH_PACKET(?QOS_2, <<"topic">>, 10, <<"payload">>))]),
-    io:format("~ts", [emqx_packet:format(?PUBACK_PACKET(?PUBACK, 98))]),
-    io:format("~ts", [emqx_packet:format(?PUBREL_PACKET(99))]),
+    io:format("~ts", [emqx_packet:format(?CONNACK_PACKET(?CONNACK_SERVER), text)]),
+    io:format("~ts", [emqx_packet:format(?PUBLISH_PACKET(?QOS_1, 1), text)]),
     io:format("~ts", [
-        emqx_packet:format(?SUBSCRIBE_PACKET(15, [{<<"topic">>, ?QOS_0}, {<<"topic1">>, ?QOS_1}]))
+        emqx_packet:format(?PUBLISH_PACKET(?QOS_2, <<"topic">>, 10, <<"payload">>), text)
     ]),
-    io:format("~ts", [emqx_packet:format(?SUBACK_PACKET(40, [?QOS_0, ?QOS_1]))]),
-    io:format("~ts", [emqx_packet:format(?UNSUBSCRIBE_PACKET(89, [<<"t">>, <<"t2">>]))]),
-    io:format("~ts", [emqx_packet:format(?UNSUBACK_PACKET(90))]),
-    io:format("~ts", [emqx_packet:format(?DISCONNECT_PACKET(128))]).
+    io:format("~ts", [emqx_packet:format(?PUBACK_PACKET(?PUBACK, 98), text)]),
+    io:format("~ts", [emqx_packet:format(?PUBREL_PACKET(99), text)]),
+    io:format("~ts", [
+        emqx_packet:format(
+            ?SUBSCRIBE_PACKET(15, [{<<"topic">>, ?QOS_0}, {<<"topic1">>, ?QOS_1}]), text
+        )
+    ]),
+    io:format("~ts", [emqx_packet:format(?SUBACK_PACKET(40, [?QOS_0, ?QOS_1]), text)]),
+    io:format("~ts", [emqx_packet:format(?UNSUBSCRIBE_PACKET(89, [<<"t">>, <<"t2">>]), text)]),
+    io:format("~ts", [emqx_packet:format(?UNSUBACK_PACKET(90), text)]),
+    io:format("~ts", [emqx_packet:format(?DISCONNECT_PACKET(128), text)]).
 
 t_parse_empty_publish(_) ->
     %% 52: 0011(type=PUBLISH) 0100 (QoS=2)
diff --git a/apps/emqx_connector/src/emqx_connector_resource.erl b/apps/emqx_connector/src/emqx_connector_resource.erl
index 8cb61793d..cdbba4f95 100644
--- a/apps/emqx_connector/src/emqx_connector_resource.erl
+++ b/apps/emqx_connector/src/emqx_connector_resource.erl
@@ -125,6 +125,7 @@ create(Type, Name, Conf0, Opts) ->
     TypeBin = bin(Type),
     ResourceId = resource_id(Type, Name),
     Conf = Conf0#{connector_type => TypeBin, connector_name => Name},
+    _ = emqx_alarm:ensure_deactivated(ResourceId),
     {ok, _Data} = emqx_resource:create_local(
         ResourceId,
         ?CONNECTOR_RESOURCE_GROUP,
@@ -132,7 +133,6 @@ create(Type, Name, Conf0, Opts) ->
         parse_confs(TypeBin, Name, Conf),
         parse_opts(Conf, Opts)
     ),
-    _ = emqx_alarm:ensure_deactivated(ResourceId),
     ok.
 
 update(ConnectorId, {OldConf, Conf}) ->
diff --git a/apps/emqx_management/src/emqx_mgmt_app.erl b/apps/emqx_management/src/emqx_mgmt_app.erl
index f8f0b6f5b..e8febb7ec 100644
--- a/apps/emqx_management/src/emqx_mgmt_app.erl
+++ b/apps/emqx_management/src/emqx_mgmt_app.erl
@@ -29,13 +29,9 @@
 
 start(_Type, _Args) ->
     ok = mria:wait_for_tables(emqx_mgmt_auth:create_tables()),
-    case emqx_mgmt_auth:init_bootstrap_file() of
-        ok ->
-            emqx_conf:add_handler([api_key], emqx_mgmt_auth),
-            emqx_mgmt_sup:start_link();
-        {error, Reason} ->
-            {error, Reason}
-    end.
+    emqx_mgmt_auth:try_init_bootstrap_file(),
+    emqx_conf:add_handler([api_key], emqx_mgmt_auth),
+    emqx_mgmt_sup:start_link().
 
 stop(_State) ->
     emqx_conf:remove_handler([api_key]),
diff --git a/apps/emqx_management/src/emqx_mgmt_auth.erl b/apps/emqx_management/src/emqx_mgmt_auth.erl
index d822eb788..e64caad57 100644
--- a/apps/emqx_management/src/emqx_mgmt_auth.erl
+++ b/apps/emqx_management/src/emqx_mgmt_auth.erl
@@ -32,7 +32,7 @@
     update/5,
     delete/1,
     list/0,
-    init_bootstrap_file/0,
+    try_init_bootstrap_file/0,
     format/1
 ]).
 
@@ -52,6 +52,7 @@
 -ifdef(TEST).
 -export([create/7]).
 -export([trans/2, force_create_app/1]).
+-export([init_bootstrap_file/1]).
 -endif.
 
 -define(APP, emqx_app).
@@ -114,11 +115,12 @@ post_config_update([api_key], _Req, NewConf, _OldConf, _AppEnvs) ->
     end,
     ok.
 
--spec init_bootstrap_file() -> ok | {error, _}.
-init_bootstrap_file() ->
+-spec try_init_bootstrap_file() -> ok | {error, _}.
+try_init_bootstrap_file() ->
     File = bootstrap_file(),
     ?SLOG(debug, #{msg => "init_bootstrap_api_keys_from_file", file => File}),
-    init_bootstrap_file(File).
+    _ = init_bootstrap_file(File),
+    ok.
 
 create(Name, Enable, ExpiredAt, Desc, Role) ->
     ApiKey = generate_unique_api_key(Name),
@@ -357,10 +359,6 @@ init_bootstrap_file(File) ->
             init_bootstrap_file(File, Dev, MP);
         {error, Reason0} ->
             Reason = emqx_utils:explain_posix(Reason0),
-            FmtReason = emqx_utils:format(
-                "load API bootstrap file failed, file:~ts, reason:~ts",
-                [File, Reason]
-            ),
 
             ?SLOG(
                 error,
@@ -371,7 +369,7 @@ init_bootstrap_file(File) ->
                 }
             ),
 
-            {error, FmtReason}
+            {error, Reason}
     end.
 
 init_bootstrap_file(File, Dev, MP) ->
diff --git a/apps/emqx_management/test/emqx_mgmt_api_api_keys_SUITE.erl b/apps/emqx_management/test/emqx_mgmt_api_api_keys_SUITE.erl
index 177216b42..f2856fe63 100644
--- a/apps/emqx_management/test/emqx_mgmt_api_api_keys_SUITE.erl
+++ b/apps/emqx_management/test/emqx_mgmt_api_api_keys_SUITE.erl
@@ -100,7 +100,7 @@ t_bootstrap_file(_) ->
     BadBin = <<"test-1:secret-11\ntest-2 secret-12">>,
     ok = file:write_file(File, BadBin),
     update_file(File),
-    ?assertMatch({error, #{reason := "invalid_format"}}, emqx_mgmt_auth:init_bootstrap_file()),
+    ?assertMatch({error, #{reason := "invalid_format"}}, emqx_mgmt_auth:init_bootstrap_file(File)),
     ?assertEqual(ok, auth_authorize(TestPath, <<"test-1">>, <<"secret-11">>)),
     ?assertMatch({error, _}, auth_authorize(TestPath, <<"test-2">>, <<"secret-12">>)),
     update_file(<<>>),
@@ -123,7 +123,7 @@ t_bootstrap_file_override(_) ->
     ok = file:write_file(File, Bin),
     update_file(File),
 
-    ?assertEqual(ok, emqx_mgmt_auth:init_bootstrap_file()),
+    ?assertEqual(ok, emqx_mgmt_auth:init_bootstrap_file(File)),
 
     MatchFun = fun(ApiKey) -> mnesia:match_object(#?APP{api_key = ApiKey, _ = '_'}) end,
     ?assertMatch(
@@ -156,7 +156,7 @@ t_bootstrap_file_dup_override(_) ->
     File = "./bootstrap_api_keys.txt",
     ok = file:write_file(File, Bin),
     update_file(File),
-    ?assertEqual(ok, emqx_mgmt_auth:init_bootstrap_file()),
+    ?assertEqual(ok, emqx_mgmt_auth:init_bootstrap_file(File)),
 
     SameAppWithDiffName = #?APP{
         name = <<"name-1">>,
@@ -190,7 +190,7 @@ t_bootstrap_file_dup_override(_) ->
 
     %% Similar to loading bootstrap file at node startup
     %% the duplicated apikey in mnesia will be cleaned up
-    ?assertEqual(ok, emqx_mgmt_auth:init_bootstrap_file()),
+    ?assertEqual(ok, emqx_mgmt_auth:init_bootstrap_file(File)),
     ?assertMatch(
         {ok, [
             #?APP{
diff --git a/apps/emqx_plugins/src/emqx_plugins.erl b/apps/emqx_plugins/src/emqx_plugins.erl
index 8ae211b55..13459136c 100644
--- a/apps/emqx_plugins/src/emqx_plugins.erl
+++ b/apps/emqx_plugins/src/emqx_plugins.erl
@@ -1049,19 +1049,22 @@ do_load_plugin_app(AppName, Ebin) ->
     end.
 
 start_app(App) ->
-    case application:ensure_all_started(App) of
-        {ok, Started} ->
+    case run_with_timeout(application, ensure_all_started, [App], 10_000) of
+        {ok, {ok, Started}} ->
             case Started =/= [] of
                 true -> ?SLOG(debug, #{msg => "started_plugin_apps", apps => Started});
                 false -> ok
-            end,
-            ?SLOG(debug, #{msg => "started_plugin_app", app => App}),
-            ok;
-        {error, {ErrApp, Reason}} ->
+            end;
+        {ok, {error, Reason}} ->
+            throw(#{
+                msg => "failed_to_start_app",
+                app => App,
+                reason => Reason
+            });
+        {error, Reason} ->
             throw(#{
                 msg => "failed_to_start_plugin_app",
                 app => App,
-                err_app => ErrApp,
                 reason => Reason
             })
     end.
@@ -1586,3 +1589,20 @@ bin(B) when is_binary(B) -> B.
 
 wrap_to_list(Path) ->
     binary_to_list(iolist_to_binary(Path)).
+
+run_with_timeout(Module, Function, Args, Timeout) ->
+    Self = self(),
+    Fun = fun() ->
+        Result = apply(Module, Function, Args),
+        Self ! {self(), Result}
+    end,
+    Pid = spawn(Fun),
+    TimerRef = erlang:send_after(Timeout, self(), {timeout, Pid}),
+    receive
+        {Pid, Result} ->
+            _ = erlang:cancel_timer(TimerRef),
+            {ok, Result};
+        {timeout, Pid} ->
+            exit(Pid, kill),
+            {error, timeout}
+    end.
diff --git a/apps/emqx_schema_registry/include/emqx_schema_registry.hrl b/apps/emqx_schema_registry/include/emqx_schema_registry.hrl
index b25042c20..289b167fd 100644
--- a/apps/emqx_schema_registry/include/emqx_schema_registry.hrl
+++ b/apps/emqx_schema_registry/include/emqx_schema_registry.hrl
@@ -34,7 +34,7 @@
     type :: serde_type(),
     eval_context :: term(),
     %% for future use
-    extra = []
+    extra = #{}
 }).
 -type serde() :: #serde{}.
 
diff --git a/apps/emqx_schema_registry/src/emqx_schema_registry.erl b/apps/emqx_schema_registry/src/emqx_schema_registry.erl
index f8d760ddc..3919cd7be 100644
--- a/apps/emqx_schema_registry/src/emqx_schema_registry.erl
+++ b/apps/emqx_schema_registry/src/emqx_schema_registry.erl
@@ -148,14 +148,19 @@ post_config_update(
 post_config_update(
     [?CONF_KEY_ROOT, schemas, NewName],
     _Cmd,
-    NewSchemas,
-    %% undefined or OldSchemas
-    _,
+    NewSchema,
+    OldSchema,
     _AppEnvs
 ) ->
-    case build_serdes([{NewName, NewSchemas}]) of
+    case OldSchema of
+        undefined ->
+            ok;
+        _ ->
+            ensure_serde_absent(NewName)
+    end,
+    case build_serdes([{NewName, NewSchema}]) of
         ok ->
-            {ok, #{NewName => NewSchemas}};
+            {ok, #{NewName => NewSchema}};
         {error, Reason, SerdesToRollback} ->
             lists:foreach(fun ensure_serde_absent/1, SerdesToRollback),
             {error, Reason}
@@ -176,6 +181,7 @@ post_config_update(?CONF_KEY_PATH, _Cmd, NewConf = #{schemas := NewSchemas}, Old
             async_delete_serdes(RemovedNames)
     end,
     SchemasToBuild = maps:to_list(maps:merge(Changed, Added)),
+    ok = lists:foreach(fun ensure_serde_absent/1, [N || {N, _} <- SchemasToBuild]),
     case build_serdes(SchemasToBuild) of
         ok ->
             {ok, NewConf};
diff --git a/apps/emqx_schema_registry/src/emqx_schema_registry_serde.erl b/apps/emqx_schema_registry/src/emqx_schema_registry_serde.erl
index 0e661c356..b5944a68e 100644
--- a/apps/emqx_schema_registry/src/emqx_schema_registry_serde.erl
+++ b/apps/emqx_schema_registry/src/emqx_schema_registry_serde.erl
@@ -48,6 +48,10 @@
 
 -type eval_context() :: term().
 
+-type fingerprint() :: binary().
+
+-type protobuf_cache_key() :: {schema_name(), fingerprint()}.
+
 -export_type([serde_type/0]).
 
 %%------------------------------------------------------------------------------
@@ -175,11 +179,12 @@ make_serde(avro, Name, Source) ->
         eval_context = Store
     };
 make_serde(protobuf, Name, Source) ->
-    SerdeMod = make_protobuf_serde_mod(Name, Source),
+    {CacheKey, SerdeMod} = make_protobuf_serde_mod(Name, Source),
     #serde{
         name = Name,
         type = protobuf,
-        eval_context = SerdeMod
+        eval_context = SerdeMod,
+        extra = #{cache_key => CacheKey}
     };
 make_serde(json, Name, Source) ->
     case json_decode(Source) of
@@ -254,8 +259,9 @@ eval_encode(#serde{type = json, name = Name}, [Map]) ->
 destroy(#serde{type = avro, name = _Name}) ->
     ?tp(serde_destroyed, #{type => avro, name => _Name}),
     ok;
-destroy(#serde{type = protobuf, name = _Name, eval_context = SerdeMod}) ->
+destroy(#serde{type = protobuf, name = _Name, eval_context = SerdeMod} = Serde) ->
     unload_code(SerdeMod),
+    destroy_protobuf_code(Serde),
     ?tp(serde_destroyed, #{type => protobuf, name => _Name}),
     ok;
 destroy(#serde{type = json, name = Name}) ->
@@ -282,13 +288,14 @@ jesse_validate(Name, Map) ->
 jesse_name(Str) ->
     unicode:characters_to_list(Str).
 
--spec make_protobuf_serde_mod(schema_name(), schema_source()) -> module().
+-spec make_protobuf_serde_mod(schema_name(), schema_source()) -> {protobuf_cache_key(), module()}.
 make_protobuf_serde_mod(Name, Source) ->
     {SerdeMod0, SerdeModFileName} = protobuf_serde_mod_name(Name),
     case lazy_generate_protobuf_code(Name, SerdeMod0, Source) of
         {ok, SerdeMod, ModBinary} ->
             load_code(SerdeMod, SerdeModFileName, ModBinary),
-            SerdeMod;
+            CacheKey = protobuf_cache_key(Name, Source),
+            {CacheKey, SerdeMod};
         {error, #{error := Error, warnings := Warnings}} ->
             ?SLOG(
                 warning,
@@ -310,6 +317,13 @@ protobuf_serde_mod_name(Name) ->
     SerdeModFileName = SerdeModName ++ ".memory",
     {SerdeMod, SerdeModFileName}.
 
+%% Fixme: we cannot uncomment the following typespec because Dialyzer complains that
+%% `Source' should be `string()' due to `gpb_compile:string/3', but it does work fine with
+%% binaries...
+%% -spec protobuf_cache_key(schema_name(), schema_source()) -> {schema_name(), fingerprint()}.
+protobuf_cache_key(Name, Source) ->
+    {Name, erlang:md5(Source)}.
+
 -spec lazy_generate_protobuf_code(schema_name(), module(), schema_source()) ->
     {ok, module(), binary()} | {error, #{error := term(), warnings := [term()]}}.
 lazy_generate_protobuf_code(Name, SerdeMod0, Source) ->
@@ -326,9 +340,9 @@ lazy_generate_protobuf_code(Name, SerdeMod0, Source) ->
 -spec lazy_generate_protobuf_code_trans(schema_name(), module(), schema_source()) ->
     {ok, module(), binary()} | {error, #{error := term(), warnings := [term()]}}.
 lazy_generate_protobuf_code_trans(Name, SerdeMod0, Source) ->
-    Fingerprint = erlang:md5(Source),
-    _ = mnesia:lock({record, ?PROTOBUF_CACHE_TAB, Fingerprint}, write),
-    case mnesia:read(?PROTOBUF_CACHE_TAB, Fingerprint) of
+    CacheKey = protobuf_cache_key(Name, Source),
+    _ = mnesia:lock({record, ?PROTOBUF_CACHE_TAB, CacheKey}, write),
+    case mnesia:read(?PROTOBUF_CACHE_TAB, CacheKey) of
         [#protobuf_cache{module = SerdeMod, module_binary = ModBinary}] ->
             ?tp(schema_registry_protobuf_cache_hit, #{name => Name}),
             {ok, SerdeMod, ModBinary};
@@ -337,7 +351,7 @@ lazy_generate_protobuf_code_trans(Name, SerdeMod0, Source) ->
             case generate_protobuf_code(SerdeMod0, Source) of
                 {ok, SerdeMod, ModBinary} ->
                     CacheEntry = #protobuf_cache{
-                        fingerprint = Fingerprint,
+                        fingerprint = CacheKey,
                         module = SerdeMod,
                         module_binary = ModBinary
                     },
@@ -345,7 +359,7 @@ lazy_generate_protobuf_code_trans(Name, SerdeMod0, Source) ->
                     {ok, SerdeMod, ModBinary};
                 {ok, SerdeMod, ModBinary, _Warnings} ->
                     CacheEntry = #protobuf_cache{
-                        fingerprint = Fingerprint,
+                        fingerprint = CacheKey,
                         module = SerdeMod,
                         module_binary = ModBinary
                     },
@@ -390,6 +404,21 @@ unload_code(SerdeMod) ->
     _ = code:delete(SerdeMod),
     ok.
 
+-spec destroy_protobuf_code(serde()) -> ok.
+destroy_protobuf_code(Serde) ->
+    #serde{extra = #{cache_key := CacheKey}} = Serde,
+    {atomic, Res} = mria:transaction(
+        ?SCHEMA_REGISTRY_SHARD,
+        fun destroy_protobuf_code_trans/1,
+        [CacheKey]
+    ),
+    ?tp("schema_registry_protobuf_cache_destroyed", #{name => Serde#serde.name}),
+    Res.
+
+-spec destroy_protobuf_code_trans({schema_name(), fingerprint()}) -> ok.
+destroy_protobuf_code_trans(CacheKey) ->
+    mnesia:delete(?PROTOBUF_CACHE_TAB, CacheKey, write).
+
 -spec has_inner_type(serde_type(), eval_context(), [binary()]) ->
     boolean().
 has_inner_type(protobuf, _SerdeMod, [_, _ | _]) ->
diff --git a/apps/emqx_schema_registry/test/emqx_schema_registry_serde_SUITE.erl b/apps/emqx_schema_registry/test/emqx_schema_registry_serde_SUITE.erl
index bdc083736..685e152e6 100644
--- a/apps/emqx_schema_registry/test/emqx_schema_registry_serde_SUITE.erl
+++ b/apps/emqx_schema_registry/test/emqx_schema_registry_serde_SUITE.erl
@@ -207,6 +207,66 @@ t_protobuf_invalid_schema(_Config) ->
     ),
     ok.
 
+%% Checks that we unload code and clear code generation cache after destroying a protobuf
+%% serde.
+t_destroy_protobuf(_Config) ->
+    SerdeName = ?FUNCTION_NAME,
+    SerdeNameBin = atom_to_binary(SerdeName),
+    ?check_trace(
+        #{timetrap => 5_000},
+        begin
+            Params = schema_params(protobuf),
+            ok = emqx_schema_registry:add_schema(SerdeName, Params),
+            {ok, {ok, _}} =
+                ?wait_async_action(
+                    emqx_schema_registry:delete_schema(SerdeName),
+                    #{?snk_kind := serde_destroyed, name := SerdeNameBin}
+                ),
+            %% Create again to check we don't hit the cache.
+            ok = emqx_schema_registry:add_schema(SerdeName, Params),
+            {ok, {ok, _}} =
+                ?wait_async_action(
+                    emqx_schema_registry:delete_schema(SerdeName),
+                    #{?snk_kind := serde_destroyed, name := SerdeNameBin}
+                ),
+            ok
+        end,
+        fun(Trace) ->
+            ?assertMatch([], ?of_kind(schema_registry_protobuf_cache_hit, Trace)),
+            ?assertMatch([_ | _], ?of_kind("schema_registry_protobuf_cache_destroyed", Trace)),
+            ok
+        end
+    ),
+    ok.
+
+%% Checks that we don't leave entries lingering in the protobuf code cache table when
+%% updating the source of a serde.
+t_update_protobuf_cache(_Config) ->
+    SerdeName = ?FUNCTION_NAME,
+    ?check_trace(
+        #{timetrap => 5_000},
+        begin
+            #{source := Source0} = Params0 = schema_params(protobuf),
+            ok = emqx_schema_registry:add_schema(SerdeName, Params0),
+            %% Now we touch the source so protobuf needs to be recompiled.
+            Source1 = <<Source0/binary, "\n\n">>,
+            Params1 = Params0#{source := Source1},
+            {ok, {ok, _}} =
+                ?wait_async_action(
+                    emqx_schema_registry:add_schema(SerdeName, Params1),
+                    #{?snk_kind := "schema_registry_protobuf_cache_destroyed"}
+                ),
+            ok
+        end,
+        fun(Trace) ->
+            ?assertMatch([], ?of_kind(schema_registry_protobuf_cache_hit, Trace)),
+            ?assertMatch([_, _ | _], ?of_kind(schema_registry_protobuf_cache_miss, Trace)),
+            ?assertMatch([_ | _], ?of_kind("schema_registry_protobuf_cache_destroyed", Trace)),
+            ok
+        end
+    ),
+    ok.
+
 t_json_invalid_schema(_Config) ->
     SerdeName = invalid_json,
     Params = schema_params(json),
diff --git a/changes/ce/fix-13357.en.md b/changes/ce/fix-13357.en.md
new file mode 100644
index 000000000..ea497a847
--- /dev/null
+++ b/changes/ce/fix-13357.en.md
@@ -0,0 +1,4 @@
+Stop returning `CONNACK` or `DISCONNECT` to clients that sent malformed CONNECT packets.
+
+- Only send `CONNACK` with reason code `frame_too_large` for MQTT-v5.0 when connecting if the protocol version field in CONNECT can be detected.
+- Otherwise **DONOT** send any CONNACK or DISCONNECT packet.
diff --git a/changes/ce/fix-13541.en.md b/changes/ce/fix-13541.en.md
new file mode 100644
index 000000000..48013cc19
--- /dev/null
+++ b/changes/ce/fix-13541.en.md
@@ -0,0 +1 @@
+Previously, if CRL checks were ever enabled for a listener, later disabling them via the configuration would not actually disable them until the listener restarted.  This has been fixed.
diff --git a/changes/ce/fix-13552.en.md b/changes/ce/fix-13552.en.md
new file mode 100644
index 000000000..5af1b4140
--- /dev/null
+++ b/changes/ce/fix-13552.en.md
@@ -0,0 +1,8 @@
+Add a startup timeout limit for the plug-in application. Currently the timeout is 10 seconds.
+
+Starting a bad plugin while EMQX is running will result in a thrown runtime error.
+When EMQX is closed and restarted, the main starting process may hang due to the the plugin application to start failures.
+
+Maybe restarting with modified:
+- Modifed config file: make the bad plugin enabled.
+- Add a plugin with bad plugin config.
diff --git a/changes/ee/fix-13543.en.md b/changes/ee/fix-13543.en.md
new file mode 100644
index 000000000..f9f56a5a6
--- /dev/null
+++ b/changes/ee/fix-13543.en.md
@@ -0,0 +1 @@
+Fixed an issue where the internal cache for Protobuf schemas in Schema Registry was not properly cleaned up after deleting or updating a schema.
diff --git a/changes/v5.7.2.en.md b/changes/v5.7.2.en.md
new file mode 100644
index 000000000..fc2d3ae87
--- /dev/null
+++ b/changes/v5.7.2.en.md
@@ -0,0 +1,87 @@
+## 5.7.2
+
+*Release Date: 2024-08-06*
+
+### Enhancements
+
+- [#13317](https://github.com/emqx/emqx/pull/13317) Added a new per-authorization source metric type: `ignore`.  This metric increments when an authorization source attempts to authorize a request but encounters scenarios where the authorization is not applicable or encounters an error, resulting in an undecidable outcome.
+
+- [#13336](https://github.com/emqx/emqx/pull/13336) Added functionality to initialize authentication data in the built-in database of an empty EMQX node or cluster using a bootstrap file in CSV or JSON format. This feature introduces new configuration entries, `bootstrap_file` and `bootstrap_type`.
+
+- [#13348](https://github.com/emqx/emqx/pull/13348) Added a new field `payload_encode` in the log configuration to determine the format of the payload in the log data. 
+
+- [#13436](https://github.com/emqx/emqx/pull/13436) Added the option to add custom request headers to JWKS requests.
+
+- [#13507](https://github.com/emqx/emqx/pull/13507) Introduced a new built-in function `getenv` in the rule engine and variform expression to facilitate access to environment variables. This function adheres to the following constraints:
+
+  - Prefix `EMQXVAR_` is added before reading from OS environment variables. For example, `getenv('FOO_BAR')` is to read `EMQXVAR_FOO_BAR`.
+  - These values are immutable once loaded from the OS environment.
+
+- [#13521](https://github.com/emqx/emqx/pull/13521) Resolved an issue where LDAP query timeouts could cause the underlying connection to become unusable, potentially causing subsequent queries to return outdated results. The fix ensures the system reconnects automatically in case of a timeout.
+
+- [#13528](https://github.com/emqx/emqx/pull/13528) Applied log throttling for the event of unrecoverable errors in data integrations.
+
+- [#13548](https://github.com/emqx/emqx/pull/13548) EMQX now can optionally invoke the `on_config_changed/2` callback function when the plugin configuration is updated via the REST API. This callback function is assumed to be exported by the `<PluginName>_app` module.
+  For example, if the plugin name and version are `my_plugin-1.0.0`, then the callback function is assumed to be `my_plugin_app:on_config_changed/2`.
+
+- [#13386](https://github.com/emqx/emqx/pull/13386) Added support for initializing a list of banned clients on an empty EMQX node or cluster with a bootstrap file in CSV format. The corresponding config entry to specify the file path is `banned.bootstrap_file`. This file is a CSV file with `,` as its delimiter. The first line of this file must be a header line. All valid headers are listed here:
+
+  - as :: required
+  - who :: required
+  - by  :: optional
+  - reason :: optional
+  - at :: optional
+  - until :: optional
+
+  See the [Configuration Manual](https://docs.emqx.com/en/enterprise/v@EE_VERSION@/hocon/) for details on each field.
+
+  Each row in the rest of this file must contain the same number of columns as the header line, and the column can be omitted then its value is `undefined`.
+
+### Bug Fixes
+
+- [#13222](https://github.com/emqx/emqx/pull/13222) Resolved issues with flags checking and error handling associated with the Will message in the `CONNECT` packet.
+  For detailed specifications, refer to:
+  
+  - MQTT-v3.1.1-[MQTT-3.1.2-13], MQTT-v5.0-[MQTT-3.1.2-11]
+  - MQTT-v3.1.1-[MQTT-3.1.2-14], MQTT-v5.0-[MQTT-3.1.2-12]
+  - MQTT-v3.1.1-[MQTT-3.1.2-15], MQTT-v5.0-[MQTT-3.1.2-13]
+  
+- [#13307](https://github.com/emqx/emqx/pull/13307) Updated `ekka` library to version 0.19.5. This version of `ekka` utilizes `mria` 0.8.8, enhancing auto-heal functionality. Previously, the auto-heal worked only when all core nodes were reachable. This update allows to apply auto-heal once the majority of core nodes are alive. For details, refer to the [Mria PR](https://github.com/emqx/mria/pull/180).
+
+- [#13334](https://github.com/emqx/emqx/pull/13334) Implemented strict mode checking for the `PasswordFlag` in the MQTT v3.1.1 CONNECT packet to align with protocol specifications.
+
+  Note: To ensure bug-to-bug compatibility, this check is performed only in strict mode.
+
+- [#13344](https://github.com/emqx/emqx/pull/13344) Resolved an issue where the `POST /clients/:clientid/subscribe/bulk` API would not function correctly if the node receiving the API request did not maintain the connection to the specified `clientid`.
+
+- [#13358](https://github.com/emqx/emqx/pull/13358) Fixed an issue when the `reason` in the `authn_complete_event` event was incorrectly displayed.
+- [#13375](https://github.com/emqx/emqx/pull/13375) The value `infinity` has been added as default value to the listener configuration fields `max_conn_rate`, `messages_rate`, and `bytes_rate`.
+
+- [#13382](https://github.com/emqx/emqx/pull/13382) Updated the `emqtt` library to version 0.4.14, which resolves an issue preventing `emqtt_pool`s from reusing pools that are in an inconsistent state.
+
+- [#13389](https://github.com/emqx/emqx/pull/13389) Fixed an issue where the `Derived Key Length` for `pbkdf2` could be set to a negative integer.
+
+- [#13389](https://github.com/emqx/emqx/pull/13389) Fixed an issue where topics in the authorization rules might be parsed incorrectly.
+
+- [#13393](https://github.com/emqx/emqx/pull/13393) Fixed an issue where plugin applications failed to restart after a node joined a cluster, resulting in hooks not being properly installed and causing inconsistent states.
+
+- [#13398](https://github.com/emqx/emqx/pull/13398) Fixed an issue where ACL rules were incorrectly cleared when reloading the built-in database for authorization using the command line.
+
+- [#13403](https://github.com/emqx/emqx/pull/13403) Addressed a security issue where environment variable configuration overrides were inadvertently logging passwords. This fix ensures that passwords present in environment variables are not logged.
+
+- [#13408](https://github.com/emqx/emqx/pull/13408) Resolved a `function_clause` crash triggered by authentication attempts with invalid salt or password types. This fix enhances error handling to better manage authentication failures involving incorrect salt or password types.
+
+- [#13419](https://github.com/emqx/emqx/pull/13419) Resolved an issue where crash log messages from the `/configs` API were displaying garbled hints. This fix ensures that log messages related to API calls are clear and understandable.
+
+- [#13422](https://github.com/emqx/emqx/pull/13422) Fixed an issue where the option `force_shutdown.max_heap_size` could not be set to 0 to disable this tuning.
+
+- [#13442](https://github.com/emqx/emqx/pull/13442) Fixed an issue where the health check interval configuration for actions/sources was not being respected. Previously, EMQX ignored the specified health check interval for actions and used the connector's interval instead. The fix ensures that EMQX now correctly uses the health check interval configured for actions/sources, allowing for independent and accurate health monitoring frequencies.
+
+- [#13503](https://github.com/emqx/emqx/pull/13503) Fixed an issue where connectors did not adhere to the configured health check interval upon initial startup, requiring an update or restart to apply the correct interval.
+
+- [#13515](https://github.com/emqx/emqx/pull/13515) Fixed an issue where the same client could not subscribe to the same exclusive topic when the node was down for some reason.
+
+- [#13527](https://github.com/emqx/emqx/pull/13527) Fixed an issue in the Rule Engine where executing a SQL test for the Message Publish event would consistently return no results when a `$bridges/...` source was included in the `FROM` clause.
+
+- [#13541](https://github.com/emqx/emqx/pull/13541) Fixed an issue where disabling CRL checks for a listener required a listener restart to take effect.
+- [#13552](https://github.com/emqx/emqx/pull/13552) Added a startup timeout limit for EMQX plugins with a default timeout of 10 seconds. Before this update, problematic plugins could cause runtime errors during startup, leading to potential issues where the main startup process might hang when EMQX is stopped and restarted.
diff --git a/deploy/charts/emqx-enterprise/Chart.yaml b/deploy/charts/emqx-enterprise/Chart.yaml
index cd795d4f4..5d19cf95a 100644
--- a/deploy/charts/emqx-enterprise/Chart.yaml
+++ b/deploy/charts/emqx-enterprise/Chart.yaml
@@ -14,8 +14,8 @@ type: application
 
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
-version: 5.7.1
+version: 5.7.2
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application.
-appVersion: 5.7.1
+appVersion: 5.7.2
diff --git a/deploy/charts/emqx/Chart.yaml b/deploy/charts/emqx/Chart.yaml
index d31648f2f..2948db061 100644
--- a/deploy/charts/emqx/Chart.yaml
+++ b/deploy/charts/emqx/Chart.yaml
@@ -14,8 +14,8 @@ type: application
 
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
-version: 5.7.1
+version: 5.7.2
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application.
-appVersion: 5.7.1
+appVersion: 5.7.2
diff --git a/scripts/ui-tests/dashboard_test.py b/scripts/ui-tests/dashboard_test.py
index c349739b6..356432b8e 100644
--- a/scripts/ui-tests/dashboard_test.py
+++ b/scripts/ui-tests/dashboard_test.py
@@ -131,10 +131,7 @@ def test_docs_link(driver, dashboard_url):
     # it's v5.x in the url
     emqx_version = 'v' + emqx_version
 
-    if prefix == 'e':
-        docs_base_url = "https://docs.emqx.com/en/enterprise"
-    else:
-        docs_base_url = "https://docs.emqx.com/en/emqx"
+    docs_base_url = "https://docs.emqx.com/en/emqx"
 
     docs_url = f"{docs_base_url}/{emqx_version}"
     xpath = f"//div[@id='app']//div[@class='nav-header']//a[@href[starts-with(.,'{docs_url}')]]"