You would have to replace the flight controller. Have you ever been able to connect Cleanflight to this drone? If you tried to adjust any settings other than PIDS or Flashed generic FW it would brick the Flight controller. Walkera drones are proprietary they are for Bind and Fly not for modification. If you have, then you need to short the 2 pins on the FC and apply power. It will then re-enable the basic boot FW. Instruction for this are on the site. Cheers But if you can still fly the drone then the FC is not bricked. and you have another issue. I would recommend that you just fly it as is.