If the keyboard behaves erratically, a reset can bring back default color mapping.
While in a static light mode, try Fn + O combined with Page Up or Page Down to switch between specific colors like red, blue, or green. how to change color on nos keyboard free
If the manufacturer’s site is unclear, search the model name plus “lighting software” (avoid paid third-party apps). If the keyboard behaves erratically, a reset can
Caveats: