1. Download a GSC. I have a page full of them here

 

2. Download this

 

3. Put your mod menu in the gametypes folder. If you want to mod zombies make a folder called "gametypes_zm" and put the zombie mod menu in there.

 

4. Put the "tesseract.dll" and the "default_mp.xex"file in the BO2 folder.

 

5. Launch the "default_mp.xex" file on your xbox.

 

6. Go on system link and start the game.

 

7. If you want to play online then after 6 go online.

 

For zombies just press b when at the main menu and go to zombies and follow 6 and 7.