diff --git a/RGB.NET.Devices.CoolerMaster/Keyboard/CoolerMasterKeyboardLedMappings.cs b/RGB.NET.Devices.CoolerMaster/Keyboard/CoolerMasterKeyboardLedMappings.cs
index 3bd2dba..0febc0f 100644
--- a/RGB.NET.Devices.CoolerMaster/Keyboard/CoolerMasterKeyboardLedMappings.cs
+++ b/RGB.NET.Devices.CoolerMaster/Keyboard/CoolerMasterKeyboardLedMappings.cs
@@ -336,7 +336,6 @@ namespace RGB.NET.Devices.CoolerMaster
             { LedId.Keyboard_PeriodAndBiggerThan, (4,10) },
             { LedId.Keyboard_SlashAndQuestionMark, (4,11) },
             { LedId.Keyboard_RightShift, (4,14) },
-            { LedId.Keyboard_U, (4,16) },
             { LedId.Keyboard_Num1, (4,15) },
             { LedId.Keyboard_Num2, (4,16) },
             { LedId.Keyboard_Num3, (4,17) },
@@ -439,7 +438,6 @@ namespace RGB.NET.Devices.CoolerMaster
             { LedId.Keyboard_PeriodAndBiggerThan, (4,10) },
             { LedId.Keyboard_SlashAndQuestionMark, (4,11) },
             { LedId.Keyboard_RightShift, (4,14) },
-            { LedId.Keyboard_U, (4,16) },
             { LedId.Keyboard_Num1, (4,15) },
             { LedId.Keyboard_Num2, (4,16) },
             { LedId.Keyboard_Num3, (4,17) },
diff --git a/RGB.NET.Devices.CoolerMaster/Keyboard/CoolerMasterKeyboardRGBDevice.cs b/RGB.NET.Devices.CoolerMaster/Keyboard/CoolerMasterKeyboardRGBDevice.cs
index 922ad52..7f35bc4 100644
--- a/RGB.NET.Devices.CoolerMaster/Keyboard/CoolerMasterKeyboardRGBDevice.cs
+++ b/RGB.NET.Devices.CoolerMaster/Keyboard/CoolerMasterKeyboardRGBDevice.cs
@@ -1,5 +1,7 @@
 using System.Collections.Generic;
+using System.Linq;
 using RGB.NET.Core;
+using RGB.NET.Devices.CoolerMaster.Native;
 
 namespace RGB.NET.Devices.CoolerMaster
 {
@@ -24,6 +26,27 @@ namespace RGB.NET.Devices.CoolerMaster
 
         #region Methods
 
+        /// <inheritdoc />
+        protected override void UpdateLeds(IEnumerable<Led> ledsToUpdate)
+        {
+            List<Led> leds = ledsToUpdate.Where(x => x.Color.A > 0).ToList();
+
+            if (leds.Count > 0)
+            {
+                // 6 by 22 seems hard-coded but it's what the CM SDK expects regardless of keyboard size
+                var matrix = new _CoolerMasterSDK.COLOR_MATRIX { KeyColor = new _CoolerMasterSDK.KEY_COLOR[6, 22] };
+                foreach (Led led in leds)
+                {
+                    (int row, int column) = ((int, int))led.CustomData;
+                    matrix.KeyColor[row, column] = new _CoolerMasterSDK.KEY_COLOR(led.Color.R, led.Color.G, led.Color.B);
+                }
+
+                _CoolerMasterSDK.SetControlDevice(DeviceInfo.DeviceIndex);
+                _CoolerMasterSDK.SetAllLedColor(matrix);
+                _CoolerMasterSDK.RefreshLed(false);
+            }
+        }
+
         /// <inheritdoc />
         protected override void InitializeLayout()
         {
diff --git a/RGB.NET.Devices.CoolerMaster/Native/_CoolerMasterSDK.cs b/RGB.NET.Devices.CoolerMaster/Native/_CoolerMasterSDK.cs
index f59f0f8..aac65d4 100644
--- a/RGB.NET.Devices.CoolerMaster/Native/_CoolerMasterSDK.cs
+++ b/RGB.NET.Devices.CoolerMaster/Native/_CoolerMasterSDK.cs
@@ -49,6 +49,7 @@ namespace RGB.NET.Devices.CoolerMaster.Native
             _enableLedControlPointer = (EnableLedControlPointer)Marshal.GetDelegateForFunctionPointer(GetProcAddress(_dllHandle, "EnableLedControl"), typeof(EnableLedControlPointer));
             _refreshLedPointer = (RefreshLedPointer)Marshal.GetDelegateForFunctionPointer(GetProcAddress(_dllHandle, "RefreshLed"), typeof(RefreshLedPointer));
             _setLedColorPointer = (SetLedColorPointer)Marshal.GetDelegateForFunctionPointer(GetProcAddress(_dllHandle, "SetLedColor"), typeof(SetLedColorPointer));
+            _setAllLedColorPointer = (SetAllLedColorPointer)Marshal.GetDelegateForFunctionPointer(GetProcAddress(_dllHandle, "SetAllLedColor"), typeof(SetAllLedColorPointer));
         }
 
         private static void UnloadCMSDK()
@@ -73,6 +74,31 @@ namespace RGB.NET.Devices.CoolerMaster.Native
 
         #region SDK-METHODS
 
+        #region Structs
+
+        // ReSharper disable InconsistentNaming
+        internal struct KEY_COLOR
+        {
+            public byte r;
+            public byte g;
+            public byte b;
+
+            public KEY_COLOR(byte colR, byte colG, byte colB)
+            {
+                r = colR;
+                g = colG;
+                b = colB;
+            }
+        }
+
+        internal struct COLOR_MATRIX
+        {
+            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 132)] public KEY_COLOR[,] KeyColor;
+        }
+        // ReSharper restore InconsistentNaming
+
+        #endregion
+
         #region Pointers
 
         private static GetSDKVersionPointer _getSDKVersionPointer;
@@ -82,6 +108,7 @@ namespace RGB.NET.Devices.CoolerMaster.Native
         private static EnableLedControlPointer _enableLedControlPointer;
         private static RefreshLedPointer _refreshLedPointer;
         private static SetLedColorPointer _setLedColorPointer;
+        private static SetAllLedColorPointer _setAllLedColorPointer;
 
         #endregion
 
@@ -112,6 +139,10 @@ namespace RGB.NET.Devices.CoolerMaster.Native
         [return: MarshalAs(UnmanagedType.I1)]
         private delegate bool SetLedColorPointer(int row, int column, byte r, byte g, byte b);
 
+        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+        [return: MarshalAs(UnmanagedType.I1)]
+        private delegate bool SetAllLedColorPointer(COLOR_MATRIX colorMatrix);
+
         #endregion
 
         // ReSharper disable EventExceptionNotDocumented
@@ -172,6 +203,14 @@ namespace RGB.NET.Devices.CoolerMaster.Native
             return _setLedColorPointer(row, column, r, g, b);
         }
 
+        /// <summary>
+        /// CM-SDK: Set Keyboard "every LED" color
+        /// </summary>
+        internal static bool SetAllLedColor(COLOR_MATRIX colorMatrix)
+        {
+            return _setAllLedColorPointer(colorMatrix);
+        }
+
         // ReSharper restore EventExceptionNotDocumented
 
         #endregion