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Error 21 Iphone 4 wont power up unless plugged in......has brand new battery

canaboost

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Sep 21, 2012
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Hello

My sisters Iphone 4 dies and is getting a error 21 when it is plugged into a computer with itunes, I looked on you tube and saw that if the phone only powers up when plugged in it is more then likely the battery. I got one for $7 and put it in but that was not the issue, and it is still doing it. Any ideas? PS it got wet but was working fine for 5 weeks afterwards.
 
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