diff --git a/app/AppConfig.cs b/app/AppConfig.cs
index 54b29514..03af8cf4 100644
--- a/app/AppConfig.cs
+++ b/app/AppConfig.cs
@@ -404,6 +404,11 @@ public static class AppConfig
         return ContainsModel("GA503") || IsSlash();
     }
 
+    public static bool IsInvertedFNLock()
+    {
+        return ContainsModel("M140");
+    }
+
     public static bool IsOLED()
     {
         return ContainsModel("OLED") || IsSlash() || ContainsModel("M7600") || ContainsModel("UX64") || ContainsModel("UX34") || ContainsModel("UX53") || ContainsModel("K360") || ContainsModel("X150") || ContainsModel("M350") || ContainsModel("K650") || ContainsModel("UM53") || ContainsModel("K660") || ContainsModel("UX84") || ContainsModel("M650") || ContainsModel("K340") || ContainsModel("K350") || ContainsModel("M140");
diff --git a/app/Input/InputDispatcher.cs b/app/Input/InputDispatcher.cs
index f7211a69..1e6ef8cd 100644
--- a/app/Input/InputDispatcher.cs
+++ b/app/Input/InputDispatcher.cs
@@ -85,7 +85,8 @@ namespace GHelper.Input
 
             InitBacklightTimer();
 
-            if (AppConfig.IsVivoZenbook()) Program.acpi.DeviceSet(AsusACPI.FnLock, AppConfig.Is("fn_lock") ? 1 : 0, "FnLock");
+            if (AppConfig.IsVivoZenbook())
+                Program.acpi.DeviceSet(AsusACPI.FnLock, AppConfig.Is("fn_lock") ^ AppConfig.IsInvertedFNLock() ? 1 : 0, "FnLock");
 
         }
 
@@ -585,17 +586,17 @@ namespace GHelper.Input
 
         public static void ToggleFnLock()
         {
-            int fnLock = AppConfig.Is("fn_lock") ? 0 : 1;
-            AppConfig.Set("fn_lock", fnLock);
+            bool fnLock = AppConfig.Is("fn_lock");
+            AppConfig.Set("fn_lock", fnLock ? 1 : 0);
 
             if (AppConfig.IsVivoZenbook())
-                Program.acpi.DeviceSet(AsusACPI.FnLock, fnLock == 1 ? 1 : 0, "FnLock");
+                Program.acpi.DeviceSet(AsusACPI.FnLock, fnLock ^ AppConfig.IsInvertedFNLock() ? 1 : 0, "FnLock");
             else
                 Program.settingsForm.BeginInvoke(Program.inputDispatcher.RegisterKeys);
 
             Program.settingsForm.BeginInvoke(Program.settingsForm.VisualiseFnLock);
 
-            Program.toast.RunToast(fnLock == 1 ? Properties.Strings.FnLockOn : Properties.Strings.FnLockOff, ToastIcon.FnLock);
+            Program.toast.RunToast(fnLock ? Properties.Strings.FnLockOn : Properties.Strings.FnLockOff, ToastIcon.FnLock);
         }
 
         public static void TabletMode()