Bluetooth keyboard keeps connecting and disconnecting after rebooting

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It seems that Keychron firmware needs to have very specific sequence of actions in order for bluetooth to work. This is how it should be in the exact order:

  1. Remove the keyboard from known bluetooth devices if it’s there.
  2. Hold Fn+[1-3] to start pairing with the keyboard
  3. In blueman-manager press “Search” (or type scan on in bluetoothctl)
  4. DO NOT CONNECT THE DEVICE, pair it instead. Right click on device in blueman-manager and select “Pair” (or type pair <mac> in bluetoothctl)
  5. Pairing takes a couple of seconds after which keyboard disconnects. Wait until it fully disconnects
  6. Now, connect the keyboard. Double click it in blueman-manager (or connect <mac> in bluetoothctl)
  7. After keyboard is connected, make it “trusted”. Right click the device in blueman-manager and select “Trusted” (or trust <mac> in bluetoothctl)
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