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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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gives me error 21

Hello !

I bought an iphone 4 and when i recieve it i tried to restore the phone and it gives me error 21 and most of them ! when is not plug in on the computer it does not turn on ! when is plug to the computer it does turn on but only keeps flashing the apple logo appears and after 5 seconds and disappears all the time ! I need HELPPP!

Should it be water damaged ?

Can I repair it or just put in on the trash ?

WHAT CAN I DOOO ? HELPP MEE

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Bruno, since you do not know the history of this phone, anything is possible. the very first thing I would do is to try to plug the phone into an AC charger. It will supply a higher amperage than your computers USB. Clean the dock connector and use a known good cable. If that does not help, replace the battery and while you are at it, check the logic board for any damage and corrosion. Error 21 can occur when security software interferes with the restore and update process, but in your case, it does sound initially like a power issue. Is it fixable, probably. Hope this helps, good luck.

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