Please ensure the following when removing and installing the case:
1. Before removing the case, use a SIM card ejector tool to remove the SIM tray. Manually unscrew the knob screw at the bottom right corner of the case counterclockwise, then use a slotted screwdriver to remove the four external slotted screws on the case. Start removing the case from the SIM tray location.
2. Please use a 4-5 mm slotted screwdriver to remove the external slotted screws on the case. Ensure the screwdriver is fully engaged in the slot to avoid scratching the case.
3. Since the screws are not magnetic, please stow them away safely after removal to avoid losing them.