PS2 Online Gaming

tried to use the cod3 code with one of the mastercodes (the 3rd one) from gamehacking via ps2rd via opl but it fails with the damn 613 error. what am i doing wrong??

don't if this is the best topic to explain my problem but here it goes: i have an european (PAL) ps2 slim and for the past 2 days i tried to play all 3 call of duty games that have online functionalities. it happens that i use opl 0.9.3 and every game id that i use (does it equal to dnas??) as well ...