na mate he's talking about not being able to play the original, not a back up online.
It's easy any way man, what you do is use a little program that you load onto the ps2, you then put the original in the ps2, you then read the code and use a program called windip to patch the code to the back up, you then burn the game and the code.
So the back up now has the DNAS code to allow you to play all backups on line, easy !
If any one needs to know how to do it i can write a tut for you.
What he's trying to do is to play an original online with a chipped ps2, simple, you need to disable the chip.