If you are using , you usually don't need the Codebreaker ISO to play games, as OPL has built-in cheat support via .cht files.
Select cheats and launch the game. (Note: This requires a specific "ELF" pathing setup to return to OPL or a physical disc). Troubleshooting Common Issues codebreaker 101 iso ps2l upd
Codebreaker is notoriously picky. Ensure your USB drive is FAT32 and preferably under 32GB. If you are using , you usually don't