Finish sliding the ribbon cable through the hinge and free the red wifi wire, as well.

The top part of the case is now free, and you are okay to set the rest of the 2DS XL aside for reassembly.

I apologize for the quality of the picture, but as you can see, the cable slides through a slot on the top case's hinge body. carefully slide the cable out of the slot and free the cable from the two pins holding it down to the case frame.