How do I determine if a Phantom 4 has been activated? I bought it new in 2016 when it was too cold to fly and then forgot about it for last six years. Now got out and updated firmware on drone but cant get it to show on my DJI account and cannot update controller.  Controller will not connect to phone.

Hello there. Thank you for reaching out. Can you please provide us with the serial number of the aircraft via PM so we can check it here on our end? Please keep us posted. Thank you.