Chosen Solution
recently changed the back glass, camera lens, battery and screen of an iPhone x and now the front camera, rear camera and flashlight is not working. if its important I lost 2 short screws for the little plate holding all the flex cable connections in place. i have tried looking to see any broken connection but everything seems good
If you have used a laser cutter to remove the rear glass and not taken out the cameras and logicboard, you most likely have damaged those components. would recommend replacing the flash flex and the cameras.
