Remove the screws.

You will need to remove the ten small screws that hold the back of the phone together.

Start by using a T5 phillips screw driver to remove the four 4.5 mm screws on the outside corners of the phone.

Next, use a T4 phillips screw driver to remove the four 4mm screws on the sides of the device.

Lastly, use the T4 phillips screw driver again to remove the last of the screws, which should be two 2mm screws on the bottom.