Chosen Solution
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 ?
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.
