Chosen Solution
This has happened to me several times. I am very frustrated. Whenever I test the new screen without the front camera flex plugged in the phone boots perfectly fine. Once I plug in the camera flex it’s starts to bootloop. And no matter how many new FCAM flex’s I try it continues to bootloop until I put the original screen back on with the original FCAM. Could this be a software issue? I have inspected the flex cables and there are no tears, they are also brand new. Please help!!
are the front cams original oem? If they are not, you will have boot loop problem! I would also dfu restore the phone as well