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Released September 16, 2016. Models A1661, A1784, and A1785. Available in 32, 128, or 256 GB configurations in Rose gold, gold, silver, black, jet black, and (Product)Red.

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Phone Got Hot during Restore and Updrade Battery died

I replaced phone battery, phone wasn't turning on (was stock in DFU mode), iTunes detected phone and displayed model but serial number showed: N/A , I proceeded to do restore and upgrade but without installing the battery connector shield, iTunes started processing and downloading, phone turn on screen only the apple logo appeared it didn’t bootup. then new battery got warm and died too like the first battery. New battery was working and consuming 0.43 amps when charging and now is at 0.00 amps. (I had the phone opened to replaced the battery witch a similar thing happened) by not installing the battery connector shield have caused a false grounding in the circuit ?

How can I troubleshoot this phone and find a solution ?

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The eMMC Nand flash memory chip on the board e.g like a hard drive has become fried from the old faulty battery.

A symptom of that is missing serial number.

Don't think this phone is fixable as it requires reading the info from the original Nand which is faulty to copy to the replacement Nand.

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Why would this affect the charging circuit, and why would iTunes still detect phone model # ?

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A short circuit from a faulty battery as in a power surge can easily kill the flash memory on a phone. The way the iPhone 6 and higher are connected in terms of circuitry make this very easy to occur.

Too much of a voltage spike comes from the bad battery and then that voltage goes into the NAND and ends up frying it. I've seen this also kill the CPU instead or both which will then result in phone model not being shown.

In your case phone model is being detected so CPU is OK but NAND is not due to S/N missing.

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Rudy Camps zal eeuwig dankbaar zijn.
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