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Thread: Help !!!!
12-29-2011, 01:36 AM #1Help !!!!
I cant restore and upgrade my iphone 4. It occurs error 21. Any guides?
12-31-2011, 11:23 AM #2
Error 21 means that you have an older version of iTunes when upgrading to iOS 5. It need to be at least on version 10.5.1. I suggest that you install the latest