After the 11 screws are loosened use the plastic opening tool and gently pry the protective plate from the back of the device.

Once the plate is off, use the same tool to gently remove the 3 ribbon cables located directly above the battery.

On the left side of the battery on the phone case, there is a groove where the plastic opening tool can be inserted to pry the battery up and out. The battery might be glued to the phone so exercise caution.

Note: The battery and motherboard does not need to be removed in order replace power and volume buttons.