Anyway in the DJI forums the admin explain that even change mode to FCC the power of the emission keep like CE so keeps the 2.4 GHz 2Km range and 500 meters for 5.8GHz.So drone is switching to fcc with fake gps app, but then when it realizes that it goes for a fake coordinates on the phone it switches back to ce imediately. This meens we have to find a way how to force it to stay in fcc once it is already switched to fcc with fake gps app and not allow to switch back to ce.
Check the link here:
DJI please clarify FCC/CE models re. vacation in different regions
DJI please clarify FCC/CE models re. vacation in different regions
forum.dji.com