diff --git a/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/InputService.kt b/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/InputService.kt
index 058648a65..b2a827e12 100644
--- a/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/InputService.kt
+++ b/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/InputService.kt
@@ -35,10 +35,15 @@ import hbb.MessageOuterClass.KeyEvent
 import hbb.MessageOuterClass.KeyboardMode
 import hbb.KeyEventConverter
 
+// const val BUTTON_UP = 2
+// const val BUTTON_BACK = 0x08
+
 const val LEFT_DOWN = 9
 const val LEFT_MOVE = 8
 const val LEFT_UP = 10
 const val RIGHT_UP = 18
+// (BUTTON_BACK << 3) | BUTTON_UP
+const val BACK_UP = 66
 const val WHEEL_BUTTON_DOWN = 33
 const val WHEEL_BUTTON_UP = 34
 const val WHEEL_DOWN = 523331
@@ -142,6 +147,11 @@ class InputService : AccessibilityService() {
             return
         }
 
+        if (mask == BACK_UP) {
+            performGlobalAction(GLOBAL_ACTION_BACK)
+            return
+        }
+
         // long WHEEL_BUTTON_DOWN -> GLOBAL_ACTION_RECENTS
         if (mask == WHEEL_BUTTON_DOWN) {
             timer.purge()
diff --git a/flutter/lib/models/input_model.dart b/flutter/lib/models/input_model.dart
index a30bb79fd..2e7a36fc1 100644
--- a/flutter/lib/models/input_model.dart
+++ b/flutter/lib/models/input_model.dart
@@ -18,7 +18,7 @@ import '../common.dart';
 import '../consts.dart';
 
 /// Mouse button enum.
-enum MouseButtons { left, right, wheel }
+enum MouseButtons { left, right, wheel, back }
 
 const _kMouseEventDown = 'mousedown';
 const _kMouseEventUp = 'mouseup';
@@ -155,6 +155,8 @@ extension ToString on MouseButtons {
         return 'right';
       case MouseButtons.wheel:
         return 'wheel';
+      case MouseButtons.back:
+        return 'back';
     }
   }
 }
@@ -1426,7 +1428,18 @@ class InputModel {
     }
   }
 
-  void onMobileBack() => tap(MouseButtons.right);
+  void onMobileBack() {
+    final minBackButtonVersion = "1.3.8";
+    final peerVersion =
+        parent.target?.ffiModel.pi.version ?? minBackButtonVersion;
+    var btn = MouseButtons.back;
+    // For compatibility with old versions
+    if (versionCmp(peerVersion, minBackButtonVersion) < 0) {
+      btn = MouseButtons.right;
+    }
+    tap(btn);
+  }
+
   void onMobileHome() => tap(MouseButtons.wheel);
   Future<void> onMobileApps() async {
     sendMouse('down', MouseButtons.wheel);