Chosen Solution
My friend is selling an iPhone 6s he bought refurbished off of ebay 2 months ago. Just today it got stuck in a boot loop, in such a case where he can turn it on by doing home + power but it shuts off moments later and goes into the loop. Techmedic told him there was nothing they can do, and an Apple call told him it would be $300 to repair due to hardware damage on main parts (presumably the logic board? Actual part wasn’t disclosed in the call). He’s selling it for $100 and I was wondering if it was worth it in that it might not actually be hardware problem, or if I should just steer clear if it likely is.
I am assuming that the device worked properly for the two months he/she had it since buying it off eBay? And did anything happen just prior to the boot loop, like contact with water, heavy drops or impacts or a repair attempt? Try these things (if you haven’t already) to see if anything helps: Try a hard reset (Home & Power button for 10 secs)Use a genuine Apple Lightning connectorUse a genuine Apple charging brick and let it charge overnightTry to connect it to different computers (mac/pc if possible) with an updated iTunesPut the phone in recovery mode (search DFU Mode). Careful, this can reset your data Use 3uTools for putting it in and out of Recovery ModeUse 3uTools to flash the firmware (you can’t downgrade)Check the condition of all the flexes (with magnification)Disconnect the Front Camera Ribbon from the logic board and reboot your phoneDisconnect the screen assembly completely and see if iTunes will recognize the phone. Otherwise, you may have a logic board issue. If you are uncomfortable doing these steps, consider finding a repair shop to do the troubleshooting. A shop that also does micro-soldering can go deeper if the problem is not modular in nature. If it is repairable, it will almost certainly cost less than $300.
