Mw3 Debug Eboot HELP

Hi,

I have a mw3 But it doesnt have a blus code The code is NPUB30787.

Where do i get a debug eboot for that Cuz i tryed some debug eboots but they didnt worked I got black screen.

Im on ps3ita 4.50 DEX.

Please reply a link.

Greetings Christos