Use a spudger or your fingernail to remove the ribbon connector which connects the speaker housing board to the microphone board.

Ribbon connectors are very fragile, do not bend kink or bend them excessively. This will result in damage to the device.

There is a white line on the ribbon connector. During reassembly ensure that the white connector is inserted up to the white line and that the white line is not misaligned with the ribbon connector.