However, if you own a completely stock, unmodded PS2 (slim 70000 series with no modifications), Code Breaker v7.0 on a burned CD-R is effectively impossible to boot without a modchip. You would need the "Swap Magic" method, which risks scratching your laser lens.
Code Breaker always requires a "Master Code" (usually starting with 90... ) to be enabled for a game before any other cheats will take effect. Code breaker ps2 v7 0 free