The motherboard will hinge up along the black horizontal bar as seen in the photo. You do not need to fully disassemble the motherboard, flex cables, etc. per other guides.

Although this lower connector and two black and white antenna cables can flex up when the motherboard is tilted up, it is smarter to disconnect just in case.

Disconnect the lower connector using the spudger/guitar pick. You may need to use a fine tip, flat screwdriver to very gently pry up the antenna connectors by the silver connector covers, then use the spudger/guitar pick/fingers to fully disconnect. Pull up and off. Try to avoid using the black and white antenna cables to pry.

The black antenna cable fits into a guide slot along the edge. It'll come out when you disconnect the connector, so upon reassembly, make sure the cable goes back into the guide slot.