To remove the battery from the casing, grab the front panel and back panel with opposite hands (as shown). The back panel is the same as the battery.

With your index finger, push in the button on the bottom of the battery to release it.

Pull the battery away from the phone.

After removing the battery, the front phone casing becomes accessible.

Locate the two star-shaped T6 screws on the bottom end of the rear of the phone, underneath the battery, as indicated by the red circles.

Remove these two screws using the Torx T6 Screwdriver.

Locate the top two U-shaped screws on the back of the phone, as shown by the red circles.

Remove these two screws with a SP 2.6 screw driver.

Note: Remove gray plastic grommets with screws.

Grab opposite panels of the phone casing and carefully open and pull apart the phone, as shown in the image.

Note: Be careful not to damage the circuit board and components as you as open the casing.