diff --git a/lib/providers/app_provider.dart b/lib/providers/app_provider.dart
index dfc381a..2be800b 100644
--- a/lib/providers/app_provider.dart
+++ b/lib/providers/app_provider.dart
@@ -293,9 +293,10 @@ class AppProvider with ChangeNotifier {
     if (publicKey == null || publicKey.isEmpty) return null;
 
     final ownPublicKey = connectionProvider.deviceInfo.publicKey;
-    final ownName =
-        connectionProvider.deviceInfo.deviceName ??
-        connectionProvider.deviceInfo.selfName;
+    final ownName = _preferredSelfDisplayName(
+      deviceName: connectionProvider.deviceInfo.deviceName,
+      selfName: connectionProvider.deviceInfo.selfName,
+    );
     if (_matchesPublicKeyPrefix(publicKey, ownPublicKey) &&
         ownName != null &&
         ownName.trim().isNotEmpty) {
@@ -340,6 +341,35 @@ class AppProvider with ChangeNotifier {
     return trimmedSenderName == trimmedOwnName;
   }
 
+  static String? preferredSelfDisplayName({
+    required String? deviceName,
+    required String? selfName,
+  }) => _preferredSelfDisplayName(deviceName: deviceName, selfName: selfName);
+
+  static String? _preferredSelfDisplayName({
+    required String? deviceName,
+    required String? selfName,
+  }) {
+    final trimmedSelfName = selfName?.trim();
+    if (trimmedSelfName != null && trimmedSelfName.isNotEmpty) {
+      return trimmedSelfName;
+    }
+
+    final trimmedDeviceName = deviceName?.trim();
+    if (trimmedDeviceName == null || trimmedDeviceName.isEmpty) {
+      return null;
+    }
+
+    if (trimmedDeviceName.toLowerCase().startsWith('meshcore-')) {
+      final stripped = trimmedDeviceName.substring('meshcore-'.length).trim();
+      if (stripped.isNotEmpty) {
+        return stripped;
+      }
+    }
+
+    return trimmedDeviceName;
+  }
+
   static bool _matchesPublicKeyPrefix(
     Uint8List? candidateKey,
     Uint8List? ownPublicKey,
@@ -820,10 +850,10 @@ class AppProvider with ChangeNotifier {
 
             final isDeletedChannel = connectionProvider
                 .shouldTreatChannelInfoAsDeleted(
-              channelIdx,
-              channelName,
-              secret,
-            );
+                  channelIdx,
+                  channelName,
+                  secret,
+                );
             final isEmptyChannelInfo = AppProvider.isDeletedChannelInfo(
               channelIdx,
               channelName,
@@ -930,6 +960,18 @@ class AppProvider with ChangeNotifier {
 
     // When a message is received
     connectionProvider.onMessageReceived = (message) {
+      if (message.isChannelMessage) {
+        debugPrint(
+          '📥 [AppProvider] Channel message received: '
+          'id=${message.id}, '
+          'senderName=${message.senderName ?? "-"}, '
+          'senderKey=${message.senderKeyShort ?? "-"}, '
+          'pathLen=${message.pathLen}, '
+          'ts=${message.senderTimestamp}, '
+          'text=${message.text}',
+        );
+      }
+
       if (AppProvider.shouldIgnoreSelfReplay(
         message: message,
         ownPublicKey: connectionProvider.deviceInfo.publicKey,
diff --git a/lib/providers/messages_provider.dart b/lib/providers/messages_provider.dart
index d56a6c4..c65495e 100644
--- a/lib/providers/messages_provider.dart
+++ b/lib/providers/messages_provider.dart
@@ -627,6 +627,13 @@ class MessagesProvider with ChangeNotifier {
           existing.text != message.text) {
         continue;
       }
+      if (message.isChannelMessage) {
+        debugPrint(
+          '🔁 [MessagesProvider] Channel duplicate match: '
+          'incoming(id=${message.id}, senderName=${message.senderName ?? "-"}, senderKey=${message.senderKeyShort ?? "-"}, pathLen=${message.pathLen}, ts=${message.senderTimestamp}) '
+          'existing(id=${existing.id}, sent=${existing.isSentMessage}, senderName=${existing.senderName ?? "-"}, senderKey=${existing.senderKeyShort ?? "-"}, pathLen=${existing.pathLen}, ts=${existing.senderTimestamp})',
+        );
+      }
       return index;
     }
 
@@ -647,9 +654,8 @@ class MessagesProvider with ChangeNotifier {
         return false;
       }
 
-      final timestampDeltaSeconds =
-          (existing.senderTimestamp - message.senderTimestamp).abs();
-      final withinChannelRepeatWindow = timestampDeltaSeconds <= 5;
+      final withinChannelRepeatWindow =
+          (existing.senderTimestamp - message.senderTimestamp).abs() <= 30;
 
       final existingSenderKey = existing.senderKeyShort;
       final incomingSenderKey = message.senderKeyShort;
@@ -660,8 +666,16 @@ class MessagesProvider with ChangeNotifier {
         return true;
       }
 
-      final existingSenderName = _normalizeSenderName(existing.senderName);
-      final incomingSenderName = _normalizeSenderName(message.senderName);
+      final existingSenderName = _normalizedResolvedSenderName(existing);
+      final incomingSenderName = _normalizedResolvedSenderName(message);
+      if (existing.isChannelMessage && message.isChannelMessage) {
+        debugPrint(
+          '🧪 [MessagesProvider] Channel dedupe check: '
+          'existing(id=${existing.id}, sent=${existing.isSentMessage}, senderName=${existing.senderName ?? "-"}, resolvedSender=${existingSenderName ?? "-"}, senderKey=${existing.senderKeyShort ?? "-"}, ts=${existing.senderTimestamp}, pathLen=${existing.pathLen}) '
+          'incoming(id=${message.id}, sent=${message.isSentMessage}, senderName=${message.senderName ?? "-"}, resolvedSender=${incomingSenderName ?? "-"}, senderKey=${message.senderKeyShort ?? "-"}, ts=${message.senderTimestamp}, pathLen=${message.pathLen}) '
+          'withinWindow=$withinChannelRepeatWindow',
+        );
+      }
       if (existingSenderName != null &&
           incomingSenderName != null &&
           existingSenderName == incomingSenderName) {
@@ -733,7 +747,13 @@ class MessagesProvider with ChangeNotifier {
     if (trimmed == null || trimmed.isEmpty) {
       return null;
     }
-    return trimmed.toLowerCase();
+
+    var normalized = trimmed.toLowerCase();
+    if (normalized.startsWith('meshcore-')) {
+      normalized = normalized.substring('meshcore-'.length).trim();
+    }
+
+    return normalized.isEmpty ? null : normalized;
   }
 
   Message _resolveSenderNameIfNeeded(Message message) {
@@ -751,6 +771,22 @@ class MessagesProvider with ChangeNotifier {
     return message.copyWith(senderName: resolvedSenderName.trim());
   }
 
+  String? _normalizedResolvedSenderName(Message message) {
+    final directName = _normalizeSenderName(message.senderName);
+    if (directName != null) {
+      return directName;
+    }
+
+    if (message.senderPublicKeyPrefix == null) {
+      return null;
+    }
+
+    final resolved = resolveContactNameCallback?.call(
+      message.senderPublicKeyPrefix,
+    );
+    return _normalizeSenderName(resolved);
+  }
+
   /// Trigger urgent notification for SAR marker
   Future<void> _triggerSarNotification(
     Message message,
diff --git a/test/providers/app_provider_channel_info_test.dart b/test/providers/app_provider_channel_info_test.dart
index cbeadd3..f9377c6 100644
--- a/test/providers/app_provider_channel_info_test.dart
+++ b/test/providers/app_provider_channel_info_test.dart
@@ -22,6 +22,16 @@ void main() {
   });
 
   group('AppProvider self replay handling', () {
+    test('prefers self name over meshcore device name', () {
+      expect(
+        AppProvider.preferredSelfDisplayName(
+          deviceName: 'MeshCore-dz0ny (SI)',
+          selfName: 'dz0ny (SI)',
+        ),
+        'dz0ny (SI)',
+      );
+    });
+
     test('ignores direct self replay without hops', () {
       final message = Message(
         id: 'dm-self',
diff --git a/test/providers/messages_provider_retransmission_test.dart b/test/providers/messages_provider_retransmission_test.dart
index 01197e9..d7388ad 100644
--- a/test/providers/messages_provider_retransmission_test.dart
+++ b/test/providers/messages_provider_retransmission_test.dart
@@ -233,7 +233,7 @@ void main() {
       provider.addMessage(
         _buildReceivedChannelReplay(
           id: 'c-late-incoming',
-          senderTimestamp: 1700000306,
+          senderTimestamp: 1700000331,
           senderName: 'dz0ny (SI)',
         ),
       );
@@ -241,6 +241,46 @@ void main() {
       expect(provider.messages, hasLength(2));
     });
 
+    test('channel replay can dedupe using lazily resolved self name', () {
+      final provider = MessagesProvider();
+      provider.addSentMessage(
+        _buildSentChannelMessage(id: 'c-lazy', senderTimestamp: 1700000400),
+      );
+      provider.markMessageSent('c-lazy', 0, 0);
+      provider.resolveContactNameCallback = (_) => 'dz0ny (SI)';
+
+      provider.addMessage(
+        _buildReceivedChannelReplay(
+          id: 'c-lazy-incoming',
+          senderTimestamp: 1700000406,
+          senderName: 'dz0ny (SI)',
+        ),
+      );
+
+      expect(provider.messages, hasLength(1));
+      expect(provider.messages.single.id, equals('c-lazy'));
+    });
+
+    test('channel replay dedupes meshcore-prefixed self sender name', () {
+      final provider = MessagesProvider();
+      provider.resolveContactNameCallback = (_) => 'MeshCore-dz0ny (SI)';
+      provider.addSentMessage(
+        _buildSentChannelMessage(id: 'c-prefix', senderTimestamp: 1700000500),
+      );
+      provider.markMessageSent('c-prefix', 0, 0);
+
+      provider.addMessage(
+        _buildReceivedChannelReplay(
+          id: 'c-prefix-incoming',
+          senderTimestamp: 1700000500,
+          senderName: 'dz0ny (SI)',
+        ),
+      );
+
+      expect(provider.messages, hasLength(1));
+      expect(provider.messages.single.id, equals('c-prefix'));
+    });
+
     test('missing ACK schedules a delayed retransmission', () {
       fakeAsync((async) {
         final provider = MessagesProvider();