I replaced the battery in my 4s and then went to charge it it told me to connect to iTunes and when I did told me to do a restore and update whent through the process and then it has a error code of 21 and can't do the restore any suggestions?
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Error 21 is a battery fault had it many many times before.
The battery you got is defective
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check the voltage of the battery in case it was flat?
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I've found a guide about "how to restore iPhone 4s after iOS 8 update".
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