If you have a Matrix Infinity then you should not have a problem. My DMS4 Pro plays everything. What happens when you put in a back up? modchips are way better than Swap Magic.
GT4 is a backup and when i put it in, (followed the rebuild precicly) it will only work with my swapdisk not my modchip. There is nothing wrong with the chip, had it looked at, works 100%