I was VERY happy with 1.4fw on my P3A + 2.7.2 app modded against mandatory updates...
Infortunalty, due the age, i have ESC errors and i make RMA, and receive a new one, V2 version...
When i connected first time i was unaware that it came with last 1.11fw, and the drone coulnd`t fly more than 30 meters..
Even with log in (it was already since it was the same equipment), no joy.
The worse, i did use also a non DJI battery, and suddenly the P3 fall from sky like a stone. Luclkly i was only testing it 1 meter above some plants and nothing happen.
Then, i install 3.11 and log in and voilà, it works. However, my non DJI battery is f***** and i dont trust it more to fly.
Yes i can start engines with it, no errors, but....my guts say i shouln´t try it for normal flights.
Apart that, i shielded the 3.11 app (dont know if it works or not), but so far it works well, more than 3KM distance and everything seems fine.
If i had choice, i would go back to 1.6fw (this model has the new engines and board), without doubts.
I even try rol back fw until 1.6, but one of components/components (gimball i think and compass had errors, that i coulnt solve or fly, so, i had to go back to 1.11.
My intuition says they make big **** draconian protections on this last fw...
Oh hell, live with it and enjoy.
Advice from old school P3 guy: Enjoy you current fw and do not update!