So I got my Viper chip installed and flashed - no problem. I can still boot originals using the 'original bios' option and I updated to bios version 0.4 via the disk explorer option in the Cobra bios 0.3, so no problem in reading the data on the disc. That, unfortunately, is where the good news ends. I finally backed up an image to a mini-dvd and tried booting it with the 'swaptrick'; all this gave me was a screen which said the disc was not recognised. I did however manage to read the disc using the disk explorer; so there's not a problem with the media I'm using (memorex) or the way I'm writing the isos. I then tried the swaptrick without swapping the discs (i.e. just keep an original in there) and the same message appeared. This begs the question: Is my Viper chip compatible with my Gamecube? I have PAL version 1 gamecube with drive version 61 (according to Cobra). The last .nfo with the bios said that a region issue had been fixed for PAL systems, I don't know if this is related at all. Any help will be appreciated; especially someone who knows how to get into contact with the guys at Mentalcube who write the Cobra bios.