Using a Soldering station, desolder all 9 wires connected to the motherboard.

Start with the red and black positive and negative wires connected to the battery (2 wires).

Then move to the yellow and red twisted wires and black and red twisted wires connected to the speakers (4 wires).

Now desolder the single grey wire connected to the antenna (1 wire).

Lastly remove the black and red wires connected to the microphone (2 wires).