The following resources may be helpful when working with the Phantom 4 Pro Drone.
Phantom 4 Pro Drone Tutorials Playlist from DJI – https://www.youtube.com/playlist?list=PL65kukZorPdOdXH1M9KGRBfaEtwboOnPC.
You may also download the Phantom 4 Pro User Manual
DJI Flysafe Website – https://www.dji.com/flysafe
Unlock link – Must be logged in to DJI website first – http://www.dji.com/flysafe/geo-system/unlock