HT201442: If you see Error 3194, Error 17, or 'This device isn't eligible for the requested build' in iTunes
Learn about If you see Error 3194, Error 17, or 'This device isn't eligible for the requested build' in iTunes
Q: Trying to restore my iphone 4 and I keep getting unknown error 21 and then it stops?
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Mar 12, 2014 12:19 PMby mario49,Hello sdavies26,
Thank you for using Apple Support Communities.
For more information, take a look at:
Resolve iOS update and restore errors in iTunes
http://support.apple.com/kb/ts1275
Resolve specific iTunes update and restore errors
http://support.apple.com/kb/ts3694#10
Check for hardware issues
Try to restore your iOS device two more times while connected with a cable, computer, and network you know are good. Also, confirm your security software and settings are allowing communication between your device and update servers. If you still see the alert when you update or restore, contact Apple support.
Common errors: 1, 10-47, 1002, 1011, 1012, 1014, 1000-1020.
Have a nice day,
Mario
