I'm a P3P flyer and have recently acquired a P3P drone needing repair. My goal is to get this drone operating again and use it as a backup should something happen to my primary drone. The appearance of the drone is near perfect ..... but the camera is missing. The plan is to get the drone operating ( verify it will fly) then pick up and add a used camera down the line to complete it as a backup. Problem is, I can't get my current P3P controller to link with the new (cameraless) drone. I've tried the DJI GO app linking option, the C1 + C2 + Record button option to no avail. Is there a way to update the firmware in the drone (to match that in my primary drone) without a camera being added ? Any other ideas on linking options will also be appreciated.