When you have finished removing all of the screws, place the plastic opening tool in the groove at the bottom left corner of the motherboard cover and lift up.

Make sure to remove the SIM card before you remove the motherboard cover. You can get the cover off without doing this, but the SIM card will be stuck underneath the cover once you put it back together.

Once a clip is released, you can detach the motherboard cover with your fingers and set aside.