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Sixth iteration of Apple iPhone, announced on September 12, 2012. Repair of this device is similar to the previous models, requiring screwdrivers and prying tools. Available as GSM or CDMA / 16, 32, or 64 GB / Black or White.
I replaced the battery and I was able to restore it. I woke up in the morning and tried to test the iPhone again, it didn't work.
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error 21 is a battery fault try the old battery and see if that works
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Tried that. Same thibg.
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