I'm new to using GCOS, and I was wondering how I'm suppossed to use it to boot the wiikey 1.2 config disc on a NTSC modded Wii (with wiikey) that has the 3.0U firmware update. I have GCOS ver4, and it looks like I can only make a multi disc with Gamecube games that are of the GMC file format. Will an iso file format also work? If not, does GCOS have a dvd swapping feature where i could boot with a GCOS multi disc and then swap in my current 1.2 config file.? Thanks in advance!