I had the same problem as you. Had channels 36 to 48 but not the channels to 165. I uninstalled the mod, installed the original app from parrot, then uninstalled it and reinstalled the mod and all the channels were there! See if it works for you.
I doubt parrot will fix the battery issues. It is a hardware design problem. Either purchase new batteries or make your own 18650 batteries as some others have mentioned. Its cheaper to dispose the 18650 batteries.
Sometimes we need it to follow a car or boat so even though more than 50m, it is still a big object to follow and easily trackable. Can the limit be disabled?
Given the potential of losing FCC forever or crashing your drone, I would advise against 'trying' this update. Do it only if you are know the risks and are willing to take it.
Can your Anafi still fly? If so, hover it at low altitude and see if it disconnects again. If everything ok, just check you are getting FCC. Don't think there is anyway to rollback.
The Anafi has a battery issue which I faced 3 weeks ago while on holiday in NZ. My battery now turn itself off almost without warning when it is drained to below 10%. The cut off is immediate causing the drone to fall from the sky. I have another good battery where this does not happen, the...