DJI GO cannot update the firmware on a Phantom 3.Incidentally, why aren't you using the DJI GO mobile app to update your firmware?
DJI GO cannot update the firmware on a Phantom 3.
The OP is flying a Phantom 3 Professional. Trust me. It's not possibleEh? Your own website has instructions on how to do so:
DJI Phantom Accessories & Tips - Phantom Help
(Under the Firmware subheading.)