What i have observed is that:
MAVIC 2 AIR
Ipa 1.1.3
when i turn the drone on with the app indoors where there is no gps signal reaching the actual drone , DBM jumps sometimes up to -60dbm / 74dbm / 82dbm . What i mean by that is that it is commonly observed that grey transmission power indicator comfortably jumps withing those ranges , as soon as I take drone outside and app says home point has been updated , power transmission indicator never ever showed below -90dbm . It usually shows around -100dbm .
I hope i am wrong and I've done something wrong as my range doesn't seems to improve with modded app , and if it does it is really minuscule. If i go with my gut feeling ,Personally think the firmware of the drone is overriding transmission power. And yes app might be showing it is in FCC mode and there is slight increase in power transmission from the remote to the drone ( as the app is hacked and allows remote for it ) but I would bet that drone is not allowing full FCC power back to the remote. I hope someone can prove me wrong. For what i have experienced during today tests and seen how power meter behaves before drone detects real GPS position. I can say that until someone can modify firmware we we will never truly experience FULL power of FCC as one can see from some guys on the YouTube.