Chosen Solution
I am currently repairing a phone which I though had a lightning connector damage, as it showed “this cable or accessory is not certified and may not work reliably with this iphone” with all chargers and cables (i tried 3 different cables which work perfectly with other iphones). I tried plugging in another battery as the original one was completely empty, I can boot the phone but it still brings up this message everytime I connect the charger. I replaced the lightning flex as well but it still shows the same error message. Already tried cleaning the port but still nothing. I think I’ve tried everything but I can’t get the phone to charge. Does someone have an idea?
Board issue, start with the U2 IC.
Try cleaning the charge port and reinstalling cable, charge port could be defective and in need of replacement.
