Open the back battery cover

Unscrew the four back screws

Remove the backing and the wire mesh microphone casing.

NOTE: The Speaker is connected to the motherboard and adhered to the back cover, so take caution when opening. I cannot foretell the chaos created if you break the speaker wire.

Gently pull apart main plate from front cover.

Also note that there is a ribbon cable connecting the front circuit board to the motherboard

Disconnect the ribbon cable.

Feed the ribbon cable through this opening. This is much easier than disconnecting from the front circuit board, which requires delicate, if not impossible maneuvers to reconnect upon reassembly.