Remove back cover. It's easy, no adhesive and no screws.

Twist off all 14 screws together and remove the back frame easily. But the screws feature different lengths, you'd better remember their positions.

Take away the volume button and power button.

Release SIM&SD card reader connector and battery connector. And get the vibrator motor free from adhesive.

Loosen the platinum foil under SIM & SD card reader from plate. And then drag the stickers out which fix the battery.

At that time, remove the battery with SIM & SD card reader assembly together.

Separate battery and SIM & SD card reader assembly.

Release LCD screen connector from motherboard.

Release sensor flex connector and front camera connector respectively.

Remove screws on the motherboard and the motherboard can be removed easily.

Remove rear camera.

Remove front camera and sensor cable.

Remove earpiece and loudspeaker.

Done.