For hardware issues, iFixit provides teardown guides for replacing keys or the controller PCB. Key Features
The top row of keys serves dual purposes: standard F-key functions and multimedia controls (accessed by holding the Fn key, if applicable, or via direct F-key mapping depending on your BIOS settings). On the standard KB212-B layout, these are primarily standard function keys used for software shortcuts (e.g., F5 to refresh, F11 for fullscreen). dell keyboard kb212-b user manual