Updating IOS 8.2
I'm trying to update my iphone 4s with IOS 8.2 but I keep getting error 21 can you tell me what this means.
iPhone 4S, iOS 8.2
Take a look at this support document. Get help with iOS update and restore errors - Apple Support It appears that error 21 could be a hardware error, but try the steps listed for that error, and you may have to contact Apple Support.