Follow each step carefully.
Press and hold the power button until the 'slide to power off' slider appears. Slide to power off.
Use a plastic opening tool to gently pry off the device case.
Use a spudger to carefully disconnect the battery from the motherboard.
Check the camera lens for any scratches or debris that may affect performance.
Inspect the camera cable for any signs of wear or damage.
Reconnect the battery, replace the device case, and power on the device.