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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 4 / iPhone 4S


iPhone 4 / iPhone 4S iPhone 4 / 4S

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Old 05-31-2011, 23:03   #1 (permalink)
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iPhone restore error


Dear Team.

I have been restoring iphone 3g but in the mid of the process, i faced failures.

"iPhone ould not be restored. An unknown error occured (21)"

what could this be..???
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Old 05-31-2011, 23:34   #2 (permalink)
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some prob with me but for me i see error 28
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Old 06-01-2011, 01:35   #3 (permalink)
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Quote:
Originally Posted by challax View Post
Dear Team.

I have been restoring iphone 3g but in the mid of the process, i faced failures.

"iPhone ould not be restored. An unknown error occured (21)"

what could this be..???
Error 21 means there is something wrong with your USB connection or with the communication between iTunes and the iPhone.

Is you usb cable plugged into a HUB? if so try without hub. Try different ports. Is you port you are trying at the front? try at the back.
Try restarting PC.
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Old 06-01-2011, 06:02   #4 (permalink)
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you can get all error solution here Iphone Error Collection With Solution » Unlock iPhone
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