Easiest way is to add the Eboot to your ps3 via FTP server (filezilla for example).
Open Rebug Toolbox on Ps3 and leave open.
On your computer, open Filezilla...Connect.
Go to PS3>GAMES>USDIR of the game (BLUS017171 for BO2). Overwrite the current Eboot in the folder with AntiBan and you are good to go.
If you play zombies, you will need the Zombies Antiboot before you play. Follow same steps above.
*edit*
Might be silly but if you can connect, are you Spoofed to latest FW? Also, make sure CID is clean...
Thanks