ISS 2 for PS2

[papero]

I have an american PS2 with a MOD Chip, unfortunately when I try to play a back up of my original ISS2 (internat. Superstar Soccer) I get black and white images and a skipping screen. Why does this happen? Do I need to patch the game before making the back up ? If so, any idea of where to get a patch for that and what kind would I need ?
ThanXXXX