1. Sidwell Ruiters's Avatar
    hi guys,
    whilst I am busy trying to restore my brothers iPhone 4 from iTunes, I get the following error message. The iPhone "iPhone" could not be restored.An unknown error occurred(21). any help suggestion guys. please ive been struggling for the past 3days already.

    thanks
    06-23-2014 10:00 AM
  2. Just_Me_D's Avatar
    1. If you're trying to go back to a previous iOS version from iOS 8 beta 1 or 2, you need to make sure you are not trying to use the backup made with iOS 8.
    2. If the iCloud activation lock was enabled prior to restoring, be sure to enter the iCloud credentials when prompted or the restore will fail.
    3. Try a different USB port.
    4. Place the device in DFU mode and then try to restore it.
    06-23-2014 10:06 AM

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