Use the plastic opening tool to remove the black ring from the speaker. This will allow you to access the screws on the metal ring.

Congratulations, you now have access to the rest of the speaker!

For reassembly, the black ring cannot snap back into the speaker the way it was disassembled. It must first go inside the black lip of the ear cushion. The black lip is located on the back side of the ear cushion. Please refer to the last two pictures on this step.

The black lip is located on the back side of the ear cushion.