After finishing with the three visible screws, look for the fourth screw. This one should be hidden behind a black sticker near the microphone arm.

Remove the sticker, and it is recommended to use a small tool that can peel the sticker off from underneath.

After removing the sticker, you can Remove the fourth and final screw, which is similar to the other three screws. Then open the headset cautiously, as the wires inside are short and sensitive.