On my Windows PC, some of the function keys on my K series keyboard cannot be entered. Specifically, the defective keys are F1, F2, F7, F8, F9, F10, F11, and F12. However, these keys work fine in B...

If your Keychron keyboard's function keys (F1~F12) are weird on your Windows PC. It is most likely it's a drive problem. For example, F1~F2 does not work, but F3~f6 works fine, then F7-F12 doesn't, or other similar problems to this.

 

The reason causing this is that the Windows PC has installed the Apple Keyboard's drive on the Keychron keyboard. To fix it, remove the Apple drivers, and uninstall the keyboard from the Windows Devices Manager. Then, replug in the Keychron keyboard.