Chosen Solution
Hello, I’ve changed a battery a couple of months ago. The owner reached out to me because his phone died and seemed to be opening on the side. The battery had swollen, probably because of bad usage by the owner who had one of those cases with buil-in power bank, and was using it all the time. Now, I replaced the battery with a new one, and phone is on a boot loop. When I try to update the ios or do a restore it through iTunes, it won’t let me, sometimes giving me the Error 9 and other times Error 4013. From what I saw in various forums, it is defenitely not a good sign, but I can’t seem to find an exact answer to the problem or what caused it. Can anyone help ? Thanks
As far as I know, those errors could be NAND or baseband depending on model. I know you mentioned your customer uses one of those battery cases all of the time, but where do you source your batteries from? Either way that issue, as far as I know and depending on model, should be repairable by someone who can do microsoldering.
Going by the information you have supplied I would first rule out a faulty tristar IC. There is a data line to the CPU from this IC. The phone might still charge but if the battery was bulging there is a good chance it damaged the tristar so replace it and see if it will update.
