diff --git a/README.md b/README.md
index 6bffe8f..7094223 100644
--- a/README.md
+++ b/README.md
@@ -63,6 +63,19 @@ Linux led controller for Logitech G213, G410, G610, G810 and G910 Keyboards.</br
 `g810-led -pp < profilefile # Load a profile`</br>
 `echo -e "k w ff0000\nk a ff0000\nk s ff0000\nk d ff0000\nc" | g810-led -pp # Set multiple keys`</br>
 
+## Testing unsuported keyboards :</br>
+Start by retrieve the VendorID and the ProductID of your keyboard with lsusb.</br>
+`lsusb`</br>
+Sample return :<br>
+`Bus 001 Device 001: ID 046d:c331 Logitech, Inc.`</br>
+In this sample VendorID is 046d and ProductID is c331. Now test your keyboard with all supported protocol :</br>
+`g810-led -dv 046d -dp c331 -tuk 1 -a 000000`</br>
+If your keyboard set all key to off you have found the protocol (1), if not continue.</br>
+`g810-led -dv 046d -dp c331 -tuk 2 -a 000000`</br>
+If your keyboard set all key to off you have found the protocol (2), if not continue.</br>
+`g810-led -dv 046d -dp c331 -tuk 3 -a 000000`</br>
+If your keyboard set all key to off you have found the protocol (3), if not, need new dump.</br>
+
 ## Building and linking against the libg810-led library :</br>
 Include in implementing source files.</br>
 ```cpp
diff --git a/src/classes/Keyboard.cpp b/src/classes/Keyboard.cpp
index 2ecaceb..bb13e7c 100644
--- a/src/classes/Keyboard.cpp
+++ b/src/classes/Keyboard.cpp
@@ -21,6 +21,15 @@ LedKeyboard::~LedKeyboard() {
 }
 
 
+bool LedKeyboard::overrideKeyboard(uint16_t vendorID, uint16_t productID, KeyboardModel model) {
+	if(model==KeyboardModel::unknown) return false;
+	SupportedKeyboards = {
+		{ vendorID, productID, (u_int16_t)model }
+	};
+	return true;
+}
+
+
 vector<LedKeyboard::DeviceInfo> LedKeyboard::listKeyboards() {
 	vector<LedKeyboard::DeviceInfo> deviceList;
 
diff --git a/src/classes/Keyboard.h b/src/classes/Keyboard.h
index b87698d..b98e969 100644
--- a/src/classes/Keyboard.h
+++ b/src/classes/Keyboard.h
@@ -16,7 +16,7 @@ class LedKeyboard {
 	
 	private:
 		
-		const std::vector<std::vector<uint16_t>> SupportedKeyboards = {
+		std::vector<std::vector<uint16_t>> SupportedKeyboards = {
 			{ 0x46d, 0xc336, (u_int16_t)KeyboardModel::g213 },
 			{ 0x46d, 0xc330, (u_int16_t)KeyboardModel::g410 },
 			{ 0x46d, 0xc333, (u_int16_t)KeyboardModel::g610 },
@@ -27,7 +27,6 @@ class LedKeyboard {
 			{ 0x46d, 0xc335, (u_int16_t)KeyboardModel::g910 }
 		};
 		
-		
 		enum class KeyAddressGroup : uint8_t {
 			logo = 0x00,
 			indicators,
@@ -135,6 +134,8 @@ class LedKeyboard {
 		~LedKeyboard();
 		
 		
+		bool overrideKeyboard(uint16_t vendorID, uint16_t productID, KeyboardModel model);
+		
 		std::vector<DeviceInfo> listKeyboards();
 		
 		bool isOpen();
diff --git a/src/helpers/help.cpp b/src/helpers/help.cpp
index 573b188..404fd0e 100644
--- a/src/helpers/help.cpp
+++ b/src/helpers/help.cpp
@@ -53,19 +53,21 @@ namespace help {
 		cout<<"  -dv\t\t\t\t\tDevice vendor ID, such as 046d for Logitech. Can be omitted to match any vendor ID"<<endl;
 		cout<<"  -dp\t\t\t\t\tDevice product ID, such as c337 for Logitech G810. Can be omitted to match any product ID"<<endl;
 		cout<<"  -ds\t\t\t\t\tDevice serial number, Can be omitted to match the first device found"<<endl;
-		cout<<"--------"<<endl;
+		cout<<"  -tuk\t\t\t\t\tTest unsuported keyboard with one of supported protocol (1-3) -dv and -dp are required"<<endl;
+		cout<<endl;
+		cout<<"Values:"<<endl;
 		if (cmdName == "g610-led")
-			cout<<"color formats :\t\t\t\tII (hex value for intensity)"<<endl;
+			cout<<"  color formats :\t\t\tII (hex value for intensity)"<<endl;
 		else
-			cout<<"color formats :\t\t\t\tRRGGBB (hex value for red, green and blue)"<<endl;
+			cout<<"  color formats :\t\t\tRRGGBB (hex value for red, green and blue)"<<endl;
 		if (cmdName == "g213-led") {
-			cout<<"region formats :\t\t\tRN (integer value for region, 1 to 5)"<<endl;
+			cout<<"  region formats :\t\tRN (integer value for region, 1 to 5)"<<endl;
 		}
-		cout<<"speed formats :\t\t\t\tSS (hex value for speed 01 to ff)"<<endl;
-		cout<<""<<endl;
-		cout<<"key values :\t\t\t\tabc... 123... and other (use --help-keys for more detail)"<<endl;
-		cout<<"group values :\t\t\t\tlogo, indicators, fkeys, ... (use --help-keys for more detail)"<<endl;
-		cout<<"startup mode :\t\t\t\twave, color"<<endl;
+		cout<<"  speed formats :\t\t\tSS (hex value for speed 01 to ff)"<<endl;
+		cout<<endl;
+		cout<<"  key values :\t\t\t\tabc... 123... and other (use --help-keys for more detail)"<<endl;
+		cout<<"  group values :\t\t\tlogo, indicators, fkeys, ... (use --help-keys for more detail)"<<endl;
+		cout<<"  startup mode :\t\t\twave, color"<<endl;
 		cout<<endl;
 	}
 	
@@ -254,9 +256,21 @@ namespace help {
 		cout<<"g610-led -k logo ff   # Set intensity of a key"<<endl;
 		cout<<"g610-led -g fkeys aa  # Set intensity of a group of keys"<<endl;
 		cout<<endl;
+		cout<<"Samples for g213 :"<<endl;
+		cout<<"g213-led -a 00ff00    # Set color of all keys"<<endl;
+		cout<<"g213-led -r 1 ff0000  # Set region 1 red"<<endl;
+		cout<<endl;
 		cout<<"Samples with pipe (for effects) :"<<endl;
 		cout<<"g810-led -pp < profilefile # Load a profile"<<endl;
 		cout<<"echo -e \"k w ff0000\\nk a ff0000\\nk s ff0000\\nk d ff0000\\nc\" | g810-led -pp # Set multiple keys"<<endl;
+		cout<<endl;
+		cout<<"Testing an unsuported keyboard :"<<endl;
+		cout<<"lsusb"<<endl;
+		cout<<"#Sample result of lsusb : ID 046d:c331 Logitech, Inc. (dv=046d and dp=c331)"<<endl;
+		cout<<"g810-led -dv 046d -dp c331 -tuk 1 -a 000000"<<endl;
+		cout<<"g810-led -dv 046d -dp c331 -tuk 2 -a 000000"<<endl;
+		cout<<"g810-led -dv 046d -dp c331 -tuk 3 -a 000000"<<endl;
+		cout<<""<<endl;
 	}
 	
 }
diff --git a/src/main.cpp b/src/main.cpp
index 62bb579..9451fcd 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -24,7 +24,10 @@ void printDeviceInfo(LedKeyboard::DeviceInfo device) {
 
 int listKeyboards(LedKeyboard &kbd) {
 	std::vector<LedKeyboard::DeviceInfo> deviceList = kbd.listKeyboards();
-	if (deviceList.empty()) return 1;
+	if (deviceList.empty()) {
+		std::cout<<"Matching or compatible device not found !"<<std::endl;
+		return 1;
+	}
 
 	std::vector<LedKeyboard::DeviceInfo>::iterator iterator;
 	for (iterator = deviceList.begin(); iterator != deviceList.end(); iterator++) {
@@ -267,17 +270,34 @@ int main(int argc, char **argv) {
 			serial = argv[argIndex + 1];
 			argIndex += 2;
 			continue;
-		}
-		else if (argc > (argIndex + 1) && arg == "-dv"){
+		} else if (argc > (argIndex + 1) && arg == "-dv"){
 			if (! utils::parseUInt16(argv[argIndex + 1], vendorID)) return 1;
 			argIndex += 2;
 			continue;
-		}
-		else if (argc > (argIndex + 1) && arg == "-dp"){
+		} else if (argc > (argIndex + 1) && arg == "-dp"){
 			if (! utils::parseUInt16(argv[argIndex + 1], productID)) return 1;
 			argIndex += 2;
 			continue;
+		} else if (argc > (argIndex + 1) && arg == "-tuk"){
+			uint8_t kbdProtocol = 0;
+			if (! utils::parseUInt8(argv[argIndex + 1], kbdProtocol)) return 1;
+			switch(kbdProtocol) {
+				case 1:
+					kbd.overrideKeyboard(vendorID, productID, LedKeyboard::KeyboardModel::g810);
+					break;
+				case 2:
+					kbd.overrideKeyboard(vendorID, productID, LedKeyboard::KeyboardModel::g910);
+					break;
+				case 3:
+					kbd.overrideKeyboard(vendorID, productID, LedKeyboard::KeyboardModel::g213);
+					break;
+				default:
+					break;
+			}
+			argIndex += 2;
+			continue;
 		}
+		
 
 		//Commands that do not need to initialize a specific device
 		if (arg == "--help" || arg == "-h") {help::usage(argv[0]); return 0;}
@@ -288,10 +308,10 @@ int main(int argc, char **argv) {
 
 		//Initialize the device for use
 		if (!kbd.open(vendorID, productID, serial)) {
-			std::cout << "Matching or compatible device not found" << std::endl;
+			std::cout << "Matching or compatible device not found !" << std::endl;
 			return 2;
 		}
-
+		
 		// Command arguments, these will cause parsing to ignore anything beyond the command and its arguments
 		if (arg == "-c") return commit(kbd);
 		else if (arg == "--print-device") {printDeviceInfo(kbd.getCurrentDevice()); return 0;}