A. 1. Ensure the app is updated to the latest version. 2. Check if the device supports color changes and is properly connected via Bluetooth. 3. Restart the app and try changing the color again. 4. Look for any specific instructions in the app regarding color changes, as some devices may have limitations.

B. 5. If the feature still does not work, try uninstalling and reinstalling the app to reset any potential bugs.