Hypothetically, assuming an M2P intelligent battery is treated with care (stored at 50-60%, checked every 2-3 months when inactive, only discharged to 25-30% when flying, recharged to storage level after cooling down post-flying), and assuming...
Sorry, I don't recall what I did over a year ago, but I was eventually able to load and run DJI fly app. I now have a controller with a new DJI Air 3s that has the app in the controller.