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Here the best setup (I think so :D) for Keychron + Linux Step 1: Set fkeyfirst by: - Create the file /etc/modprobe.d/hid_apple.conf. Add this line to the file: "options hid_apple fnmode=2" - Save the file and execute the following command: "sudo update-initramfs -u" - Reboot Step 2: Use the keyboard in Windows/Android mode Step 3: If get stuck with numpad mode: Double hit F6 or fn + F6. I've been using this config since the very first day, both bluetooth and cable with no problem.

Alternative config: For step 1: you can just do "echo 2 | tee sudo /sys/module/hid_apple/parameters/fnmode" instead. But the setting will be reset after reboot, so the method above is to make sure that the setting is permanent after reboot. Also someone recommends to create a udev rule for keychron devices