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Q: can't update my iphone 5 error message 21
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Nov 18, 2015 6:40 AMby alex_h1,Hello neto2113,
Thanks for using Apple Support Communities.
I see you're getting error 21 in iTunes when trying to restore your iPhone. This indicates there could be a hardware issue with your iPhone. To troubleshoot this error, please follow through the steps outlined below.
Check for hardware issues
Errors: 1, 3, 11, 12, 13, 14, 16, 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 53, 56, 1002, 1004, 1011, 1012, 1014, 1667, or 1669.
Your device or computer might have a hardware issue that stops the update or restore from completing.
- Check that your security software and settings aren't blocking your device from communicating with the Apple update server.
- Then try to restore your iOS device two more times while connected with a cable, computer, and network you know are good.
- Make sure that your security software and settings are allowing communication between your device and update servers.
- If you still see the error message when you update or restore, contact Apple support.
Get help with iOS update and restore errors
Have a good one.
