I have a similar issue, when I turno on the P4P. starts making a loud whirring vibrating noise, Gimbal Shacing and also when I start the calibration gets stuck at 50%. Can anyone already solve this kind of problem?

Hi, sorry for the inconvenience. Can you provide a video when you are doing the gimbal calibration? You can upload it using google-drive or Dropbox and provide the link here. The sound that you are hearing,  do you think it is the internal fan? Can you feel the aircraft overheating?