how to Downgrad Ios 8.2 to IOS 8.1.2
how to Downgrad Ios 8.2 to IOS 8.1.2
iPhone 4S, iOS 8.1.3
You can't.
There is no supported downgrade path for iOS. iOS upgrades alter the firmware of the device to receive the update. downgrading would for that reason and several others not work, and cause more problems than it may solve if it were to solve any.
