I honestly can't remember which way i did it buddy but I still have FCC on 1.65 official APK 6.6.6 maybe was because updated drone from 1.63 to 1.64 with modded APK I'm only a noob with the anafi buddy so trying to explain the best I can
Just thinking I had modded APK when on 1.63 was able to update the app through play store then upgraded to 1.64 never lost FCC now on 1.65 still with FCC APK V6.6.6
Nope updated with official APK I even downloaded APK through play store on different phone which never had any freeflight app on it before and still have FCC channels