If you are going to play backups or "modded" games you need a modchip, or the beta version of the leaked ISO loader. That loader though is rubbish, but there is no way to play burned games without a mod chip. You can homebrew and pay .roms and .wads. If you want to knonw what roms and wads are just ask. I am sure Dark Mod or Spyman can help you with finding a mod chip for you.