HT1414: Use iTunes to restore your iOS device to factory settingsLearn about Use iTunes to restore your iOS device to factory settings
Currently Being ModeratedJan 31, 2013 2:56 PM (in response to kauanafilha)
These errors typically occur when security software interferes with the restore and update process. FollowTroubleshooting security software issues to resolve this issue. In rare cases, these errors may be a hardware issue. If the errors persist on another computer, the device may need service.
Currently Being ModeratedJan 31, 2013 2:59 PM (in response to kauanafilha)
If bhazel recommendation does not help. Make Genius reservation or set up Service and take or send iPhone to Apple for resolution under Warranty. Most common hardware cause of Error 21 is faulty battery.
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