I have recently bought a K4 Keychron. I cannot connect my keyboard via Bluetooth, it works when I connect it with wire. I had also tried my Logitech K480, it also couldn't connect to my PC. The PC couldn't even search the device. The interesting thing is the Bluetooth works for other devices like my JBL Bluetooth speaker and PS Gamepad with DS4Windows. It just can't connect my wireless keyboards. Can anyone help me, I have already tried reinstalling the bluetooth device and drivers and literally all suggestion that Windows officially suggests.