Just got an iPhone 12 with 88 percent battery health, it was on iOS 16.
I downloaded the iOS 17.1.1 ipsw and clean flashed it with 3utools, everything was fine, then I restored my backup from the xs that I had, after that I felt that the phone is much slower, lags and heats up really fast when using cellular data.
Is that the problem of the phone? Or it’s from restoring iTunes backup from my xs?