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Fourth generation iPhone. Repair is straightforward, but the front glass and LCD must be replaced as a unit. GSM / 8, 16, or 32 GB capacity / Model A1332 / Black and White. This page aims to help users troubleshoot, fix, and seek help for the iPhone 4.

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My iPhone 4 keeps saying error 21 when I restore it?

I have tried legit for days to fix this. when it is plugged into the computer it will stay on but as soon as its unplugged it goes blank and wont turn on. I have tried holding the home and power button like other sites have said but still have no luck. I was thinking it was a bad battery maybe? Please help!

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Try new battery. Error 21 has been associated with battery problems. Hopefully this will be the complete fix.

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