Use a 00 Phillips head screwdriver to remove the 3.9 mm Phillips screws holding the metal ring in place. There should be 7 in each earpiece.
Make sure the screws you've already removed don't fall into the speaker itself (the circular arrangement of holes on the red piece directly below the metal ring). The speaker itself is magnetic, so getting screws out can be tricky. You should have tweezers available in case a screw or other piece of metal does fall into the speaker.
Once all the screws are removed, the metal ring can be removed by hand.
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