I did this hack today with a 4gb SDHC card and it worked great, but I forgot to calibrate the unit before I did it, so I could not touch the edit button. But I found another way to fix this without have to turn your car off and editing the calibration. Once you complete up to step 4, on the very bottom right there is a button which is a small touch keyboard. If you click it, it will open. And then you can do steps 5, 6 and 7
5. Select My Flash Disk, press edit up top and copy. Select “my flash disk†and then use the keyboard and tap the control button “Ctrl†and then tap the “Câ€