Chosen Solution
Hey there, I did a battery replacement following iFixit guide. Unfortunately, the adhesive was super strong. I used a guitar string like suggested in the guide. In the image they only use the floss from one side, I used the guitar string from both sides. I reassembled everything, but phone wont turn on. Backlight is on, sometimes I can see apple logo. I noticed some flex cables on the top side (where floss is not used!) which have some silver scratches. Is it possible that I broke these flex cables? One goes to the vibrator siwtch and volume controls, the other one I am not sure? Connecting to a mac finder only says “There is a problem with the iPhone “iPhone” that requires it to be updated or restored.”
What you have described sounds like what we call long screw damage where the wrong size screw has been inserted in the shield that covers the LCD connectors. If you can, take and post a close-up pic of the screw hole in the red square.
The top flex is the power flex which if you used a metal guitar string could have been damaged. I’d leave the battery unglued and buy a new power flex and fit it. Test it with the battery unstuck and if everything is ok, stick it back in with adhesive.
