Original post by: Minho ,
A bootlooping device can be caused by many things. Give us more history by commenting on this answer. 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 connector * Use a genuine Apple charging brick and let it charge overnight * Try to connect it to different computers (mac/pc if possible) with an updated iTunes * Put the phone in recovery mode (search DFU Mode). Careful, this can reset your data * Use 3uTools for putting it in and out of Recovery Mode * Use 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 phone * Disconnect 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.