I've the iphone 4s, and My battery show me 40% than the phone shut down,some of my friends the same, from when i'll update the system os.

I've the iphone 4s, and My battery show me 40% than the phone shut down,some of my friends the same, from when i'll update the system os.
We've think that Apple do it for making the change of the phone!!  :O
what will we have to do for making the downgrade of OS of the phone?
tks Andrea

Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new).  Try each of these in order until the issue is resolved.
Apple has never supported downgrading of the iOS.

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