I just successfully updated my M13 after 2 days of frustration. I went from softwre 1.04 to 2.04. Bit the bullet and purchased the MIO cable at Guitar Center. The trick is I hooked the OUT MIDI cable (black) to the IN MIDI port on the M13. didn't use the second MIDI plug at all. used MIOX for windows, followed the update instructions on this site and it worked!!! what a pain to get it to the point where it would work though. good luck.