What leads should be connected for SDIO to work? As you said Foxdie, it could be just soldered to the PCB, since there is very little \'activity\' showing around some of the pins. Just the first three or four seem connected to anything that looks like a trace, but on the other hand, with them multilayered pcb\'s you never know.
Three or four sounds too little tho for doing even standard SD work.
Keen an eye on those screws, and don\'t disasamble your Z in a room with thick fluffy carpet on the floor
Gr.
Hertog