Follow each step carefully.
Press and hold the power button for 3 seconds, then slide to power off.
Follow the Display Adhesive Removal Guide to detach the display.
Locate the TrueDepth camera connector and gently lift it using a spudger.
Unscrew the screws holding the camera assembly in place and lift it out.
Position the new camera assembly and secure it with screws.
Press down on the camera connector until it clicks into place.
Align the display and press down until it snaps into place.
Press and hold the power button for 3 seconds to turn on the device.