diff --git a/CHANGELOG.md b/CHANGELOG.md
index 829beed..9a341ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 3.8.3+hotfix.12
+
+- [Bug fixes and performance enhancements.](https://github.com/openimsdk/openim-sdk-core/releases/tag/v3.8.3-patch.12)
+
 ## 3.8.3+hotfix.10.1
 
 - [Bug fixes and performance enhancements.](https://github.com/openimsdk/openim-sdk-core/releases/tag/v3.8.3-patch.10)
diff --git a/android/build.gradle b/android/build.gradle
index 1197098..b1b0183 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -36,7 +36,7 @@ android {
     }
 
     dependencies {
-        implementation 'io.openim:core-sdk:3.8.3-patch10@aar'
+        implementation 'io.openim:core-sdk:3.8.3-patch12@aar'
         testImplementation("junit:junit:4.13.2")
         testImplementation("org.mockito:mockito-core:5.0.0")
     }
diff --git a/android/settings.gradle b/android/settings.gradle
index dc38937..fb01670 100644
--- a/android/settings.gradle
+++ b/android/settings.gradle
@@ -1 +1,2 @@
 rootProject.name = 'flutter_openim_sdk'
+ 
\ No newline at end of file
diff --git a/android/src/main/java/io/openim/flutter_openim_sdk/listener/OnUserListener.java b/android/src/main/java/io/openim/flutter_openim_sdk/listener/OnUserListener.java
index f724d8c..a2977b7 100644
--- a/android/src/main/java/io/openim/flutter_openim_sdk/listener/OnUserListener.java
+++ b/android/src/main/java/io/openim/flutter_openim_sdk/listener/OnUserListener.java
@@ -13,19 +13,4 @@ public class OnUserListener implements open_im_sdk_callback.OnUserListener {
     public void onUserStatusChanged(String s) {
         CommonUtil.emitEvent("userListener", "onUserStatusChanged", s);
     }
-
-    @Override
-    public void onUserCommandAdd(String s) {
-        CommonUtil.emitEvent("userListener", "onUserCommandAdd", s);
-    }
-
-    @Override
-    public void onUserCommandDelete(String s) {
-        CommonUtil.emitEvent("userListener", "onUserCommandDelete", s);
-    }
-
-    @Override
-    public void onUserCommandUpdate(String s) {
-        CommonUtil.emitEvent("userListener", "onUserCommandUpdate", s);
-    }
 }
diff --git a/example/android/build/reports/problems/problems-report.html b/example/android/build/reports/problems/problems-report.html
index 9da070b..e86a0f1 100644
--- a/example/android/build/reports/problems/problems-report.html
+++ b/example/android/build/reports/problems/problems-report.html
@@ -650,7 +650,7 @@ code + .copy-button {
 <script type="text/javascript">
 function configurationCacheProblems() { return (
 // begin-report-data
-{"diagnostics":[{"problem":[{"text":"Disabling Gradle user home cache cleanup with the 'org.gradle.cache.cleanup' property has been deprecated."}],"severity":"WARNING","problemDetails":[{"text":"This is scheduled to be removed in Gradle 9.0."}],"contextualLabel":"Disabling Gradle user home cache cleanup with the 'org.gradle.cache.cleanup' property has been deprecated.","documentationLink":"https://docs.gradle.org/8.12/userguide/upgrading_version_8.html#disabling_user_home_cache_cleanup","problemId":[{"name":"deprecation","displayName":"Deprecation"},{"name":"disabling-gradle-user-home-cache-cleanup-with-the-org-gradle-cache-cleanup-property","displayName":"Disabling Gradle user home cache cleanup with the 'org.gradle.cache.cleanup' property has been deprecated."}]},{"problem":[{"text":"Disabling Gradle user home cache cleanup with the 'org.gradle.cache.cleanup' property has been deprecated."}],"severity":"WARNING","problemDetails":[{"text":"This is scheduled to be removed in Gradle 9.0."}],"contextualLabel":"Disabling Gradle user home cache cleanup with the 'org.gradle.cache.cleanup' property has been deprecated.","documentationLink":"https://docs.gradle.org/8.12/userguide/upgrading_version_8.html#disabling_user_home_cache_cleanup","problemId":[{"name":"deprecation","displayName":"Deprecation"},{"name":"disabling-gradle-user-home-cache-cleanup-with-the-org-gradle-cache-cleanup-property","displayName":"Disabling Gradle user home cache cleanup with the 'org.gradle.cache.cleanup' property has been deprecated."}]}],"problemsReport":{"totalProblemCount":2,"buildName":"android","requestedTasks":"assembleDebug","documentationLink":"https://docs.gradle.org/8.12/userguide/problems-report.html","documentationLinkCaption":"Problem report","summaries":[]}}
+{"diagnostics":[{"locations":[{"pluginId":"dev.flutter.flutter-gradle-plugin"}],"problem":[{"text":"Space-assignment syntax in Groovy DSL has been deprecated."}],"severity":"WARNING","problemDetails":[{"text":"This is scheduled to be removed in Gradle 10.0."}],"contextualLabel":"Space-assignment syntax in Groovy DSL has been deprecated.","documentationLink":"https://docs.gradle.org/8.12/userguide/upgrading_version_8.html#groovy_space_assignment_syntax","problemId":[{"name":"deprecation","displayName":"Deprecation"},{"name":"space-assignment-syntax-in-groovy-dsl","displayName":"Space-assignment syntax in Groovy DSL has been deprecated."}],"solutions":[[{"text":"Use assignment ('url = <value>') instead."}]]},{"locations":[{"pluginId":"dev.flutter.flutter-gradle-plugin"}],"problem":[{"text":"Space-assignment syntax in Groovy DSL has been deprecated."}],"severity":"WARNING","problemDetails":[{"text":"This is scheduled to be removed in Gradle 10.0."}],"contextualLabel":"Space-assignment syntax in Groovy DSL has been deprecated.","documentationLink":"https://docs.gradle.org/8.12/userguide/upgrading_version_8.html#groovy_space_assignment_syntax","problemId":[{"name":"deprecation","displayName":"Deprecation"},{"name":"space-assignment-syntax-in-groovy-dsl","displayName":"Space-assignment syntax in Groovy DSL has been deprecated."}],"solutions":[[{"text":"Use assignment ('url = <value>') instead."}]]},{"locations":[{"pluginId":"dev.flutter.flutter-gradle-plugin"}],"problem":[{"text":"Space-assignment syntax in Groovy DSL has been deprecated."}],"severity":"WARNING","problemDetails":[{"text":"This is scheduled to be removed in Gradle 10.0."}],"contextualLabel":"Space-assignment syntax in Groovy DSL has been deprecated.","documentationLink":"https://docs.gradle.org/8.12/userguide/upgrading_version_8.html#groovy_space_assignment_syntax","problemId":[{"name":"deprecation","displayName":"Deprecation"},{"name":"space-assignment-syntax-in-groovy-dsl","displayName":"Space-assignment syntax in Groovy DSL has been deprecated."}],"solutions":[[{"text":"Use assignment ('shrinkResources = <value>') instead."}]]}],"problemsReport":{"totalProblemCount":3,"buildName":"android","requestedTasks":"","documentationLink":"https://docs.gradle.org/8.12/userguide/problems-report.html","documentationLinkCaption":"Problem report","summaries":[]}}
 // end-report-data
 );}
 </script>
diff --git a/example/ios/Podfile.lock b/example/ios/Podfile.lock
index 7eb6643..9dbfda0 100644
--- a/example/ios/Podfile.lock
+++ b/example/ios/Podfile.lock
@@ -2,8 +2,8 @@ PODS:
   - Flutter (1.0.0)
   - flutter_openim_sdk (0.0.1):
     - Flutter
-    - OpenIMSDKCore (= 3.8.3-hotfix.10)
-  - OpenIMSDKCore (3.8.3-hotfix.10)
+    - OpenIMSDKCore (= 3.8.3-hotfix.12)
+  - OpenIMSDKCore (3.8.3-hotfix.12)
 
 DEPENDENCIES:
   - Flutter (from `Flutter`)
@@ -21,9 +21,9 @@ EXTERNAL SOURCES:
 
 SPEC CHECKSUMS:
   Flutter: e0871f40cf51350855a761d2e70bf5af5b9b5de7
-  flutter_openim_sdk: 59aa0c08eb7499a1790168e10539e4dd915ced6e
-  OpenIMSDKCore: bc9a6e5de2aabed76e4f69fe06a7c9df1d945afc
+  flutter_openim_sdk: bb2a5af4aeda4b44362ca6c223c1515e2fee795d
+  OpenIMSDKCore: 02383b2a3f989a1fff29ad5f83c1dac1ee5bfb36
 
-PODFILE CHECKSUM: 819463e6a0290f5a72f145ba7cde16e8b6ef0796
+PODFILE CHECKSUM: 7be2f5f74864d463a8ad433546ed1de7e0f29aef
 
 COCOAPODS: 1.16.2
diff --git a/example/pubspec.lock b/example/pubspec.lock
index 9f0b254..58917a6 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -76,7 +76,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "3.8.3+hotfix.10"
+    version: "3.8.3+hotfix.10.1"
   flutter_test:
     dependency: "direct dev"
     description: flutter
diff --git a/ios/flutter_openim_sdk.podspec b/ios/flutter_openim_sdk.podspec
index c869fff..012a723 100644
--- a/ios/flutter_openim_sdk.podspec
+++ b/ios/flutter_openim_sdk.podspec
@@ -17,13 +17,13 @@ A new Flutter project.
   s.dependency 'Flutter'
   s.platform = :ios, '11.0'
 
-  s.dependency 'OpenIMSDKCore','3.8.3-hotfix.10'
+  s.dependency 'OpenIMSDKCore','3.8.3-hotfix.12'
   s.static_framework = true
   s.library = 'resolv'
 
   # s.vendored_frameworks = 'Framework/*.xcframework'
   # Flutter.framework does not contain a i386 slice.
-  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386 arm64' }
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
   s.swift_version = '5.0'
 
   s.resource_bundles = {'flutter_openim_sdk_privacy' => ['Resources/PrivacyInfo.xcprivacy']}
diff --git a/lib/src/models/group_info.dart b/lib/src/models/group_info.dart
index ccb91b8..b8e8579 100644
--- a/lib/src/models/group_info.dart
+++ b/lib/src/models/group_info.dart
@@ -429,7 +429,7 @@ class GetGroupApplicationListAsRecipientReq {
   final int offset;
   final int count;
 
-  GetGroupApplicationListAsRecipientReq({ 
+  GetGroupApplicationListAsRecipientReq({
     this.groupIDs = const [],
     this.handleResults = const [],
     required this.offset,
@@ -466,8 +466,8 @@ class GetGroupApplicationListAsApplicantReq {
   GetGroupApplicationListAsApplicantReq({
     this.groupIDs = const [],
     this.handleResults = const [],
-    required this.offset,
-    required this.count,
+    this.offset = 0,
+    this.count = 40,
   });
 
   GetGroupApplicationListAsApplicantReq.fromJson(Map<String, dynamic> json)
diff --git a/lib/src/models/message.dart b/lib/src/models/message.dart
index 592a110..3f9018f 100644
--- a/lib/src/models/message.dart
+++ b/lib/src/models/message.dart
@@ -257,7 +257,8 @@ class Message {
 
   @override
   bool operator ==(Object other) =>
-      identical(this, other) || other is Message && runtimeType == other.runtimeType && clientMsgID == other.clientMsgID;
+      identical(this, other) ||
+      other is Message && runtimeType == other.runtimeType && clientMsgID == other.clientMsgID;
 
   @override
   int get hashCode => clientMsgID.hashCode;
@@ -787,12 +788,15 @@ class AttachedInfoElem {
   /// Do not send offline push notifications
   bool? notSenderNotificationPush;
 
+  UploadProgress? uploadProgress;
+
   AttachedInfoElem({
     this.groupHasReadInfo,
     this.isPrivateChat,
     this.hasReadTime,
     this.burnDuration,
     this.notSenderNotificationPush,
+    this.uploadProgress,
   });
 
   AttachedInfoElem.fromJson(Map<String, dynamic> json) {
@@ -801,6 +805,7 @@ class AttachedInfoElem {
     hasReadTime = json['hasReadTime'];
     burnDuration = json['burnDuration'];
     notSenderNotificationPush = json['notSenderNotificationPush'];
+    uploadProgress = json['uploadProgress'] == null ? null : UploadProgress.fromJson(json['uploadProgress']);
   }
 
   Map<String, dynamic> toJson() {
@@ -810,6 +815,33 @@ class AttachedInfoElem {
     data['hasReadTime'] = this.hasReadTime;
     data['burnDuration'] = this.burnDuration;
     data['notSenderNotificationPush'] = this.notSenderNotificationPush;
+    data['uploadProgress'] = uploadProgress?.toJson();
+
+    return data;
+  }
+}
+
+class UploadProgress {
+  int? total;
+  int? save;
+  int? current;
+  String? uploadID;
+
+  UploadProgress({this.total, this.save, this.current, this.uploadID});
+
+  UploadProgress.fromJson(Map<String, dynamic> json) {
+    total = json['total'] ?? 0;
+    save = json['save'] ?? 0;
+    current = json['current'] ?? 0;
+    uploadID = json['uploadID'] ?? '';
+  }
+
+  Map<String, dynamic> toJson() {
+    final data = <String, dynamic>{};
+    data['total'] = total;
+    data['save'] = save;
+    data['current'] = current;
+    data['uploadID'] = uploadID;
     return data;
   }
 }
@@ -879,7 +911,9 @@ class AdvancedTextElem {
 
   AdvancedTextElem.fromJson(Map<String, dynamic> json) {
     text = json['text'];
-    messageEntityList = json['messageEntityList'] == null ? null : (json['messageEntityList'] as List).map((e) => MessageEntity.fromJson(e)).toList();
+    messageEntityList = json['messageEntityList'] == null
+        ? null
+        : (json['messageEntityList'] as List).map((e) => MessageEntity.fromJson(e)).toList();
   }
 
   Map<String, dynamic> toJson() {
@@ -961,7 +995,8 @@ class ReadReceiptInfo {
   /// Conversation type [ConversationType]
   int? sessionType;
 
-  ReadReceiptInfo({this.userID, this.groupID, this.msgIDList, this.readTime, this.msgFrom, this.contentType, this.sessionType});
+  ReadReceiptInfo(
+      {this.userID, this.groupID, this.msgIDList, this.readTime, this.msgFrom, this.contentType, this.sessionType});
 
   ReadReceiptInfo.fromJson(Map<String, dynamic> json) {
     userID = json['uid'] ?? json['userID'];
@@ -1132,7 +1167,8 @@ class AdvancedMessage {
   });
 
   AdvancedMessage.fromJson(Map<String, dynamic> json) {
-    messageList = json['messageList'] == null ? null : (json['messageList'] as List).map((e) => Message.fromJson(e)).toList();
+    messageList =
+        json['messageList'] == null ? null : (json['messageList'] as List).map((e) => Message.fromJson(e)).toList();
     isEnd = json['isEnd'];
     errCode = json['errCode'];
     errMsg = json['errMsg'];
diff --git a/lib/src/openim.dart b/lib/src/openim.dart
index 82d932d..c8d8f3f 100644
--- a/lib/src/openim.dart
+++ b/lib/src/openim.dart
@@ -2,7 +2,7 @@ import 'package:flutter/services.dart';
 import 'package:flutter_openim_sdk/flutter_openim_sdk.dart';
 
 class OpenIM {
-  static const version = '3.8.3+hotfix.10.1';
+  static const version = '3.8.3+hotfix.12';
 
   static const _channel = MethodChannel('flutter_openim_sdk');
 
diff --git a/pubspec.yaml b/pubspec.yaml
index b7fd63e..8ca2d22 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: flutter_openim_sdk
 description: An instant messaging plug-in that supports Android and IOS. And the server is also all open source.
-version: 3.8.3+hotfix.10.1
+version: 3.8.3+hotfix.12
 homepage: https://www.openim.io
 repository: https://github.com/openimsdk/open-im-sdk-flutter