Use tweezers to unstick the medium width yellow ribbon cable from the motherboard.

Use a small opening tool to slide the two small black holding clips off of the white connector to which the medium width yellow ribbon cable is attached.

Use your fingers to gently pull the medium width yellow ribbon cable out of the white connector.

Repeat the last two actions to disconnect the narrower yellow ribbon cable and the wider yellow ribbon cable from the motherboard.

The motherboard and battery will now be detached from any ribbon cables connecting to the device.