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[* black] Next, we turn to the underside of the quadricopter.
[* black] After removing four T6 Torx screws, the lower plate can be lifted off to reveal the motherboard and navigation board.
[* black] The navigation board is connected to the motherboard by eight pins and comes out without any hassle.
+[* black] NOTE: The ribbon cable must be removed with EXTREME care otherwise it will tear. If you look at the connector there is a black section where the cable connects, you need to gently pull this black portion, and you should then be able to easily remove the cable.