Download the files from the following link http://www.mediafire.com/?1elkn6f5b0pcf
Step 1: Download the files above.
Step 2: Open up the savegame.svg that I have provided in Horizon.
Step 3: Change the ID's on the savegame.svg, to your Save game ID's.
Step 4: Save, rehash, and resign the savegame.svg.
Step 5: Inject both the offline profile, and the modded savegame.svg into your USB flash drive.
Step 6: Load up Black Ops.
Step 7: Plug your USB flash drive into your Xbox 360 console.
Step 8: Select the USB flash drive as the storage device.
Step 9: Go to campaign, and press resume.
Step 10: Once the campaign game has loaded up, get a secondary controller, and sign into the offline account.
Step 11: Click the back button on your main controller, and then leave the game.
Step 12: Sign out of the offline account, on your secondary controller.
Step 13: Start up a solo zombie game on your main controller.
Step 14: Once the game has started, click the back button, and then quit.
Step 15: Un-plug the USB flash drive from your Xbox 360 console.
Step 16: Plug the USB flash drive back into your computer.
Step 17: Re-inject the offline profile into your USB flash drive.
Step 18: Unplug the USB flash drive from your computer, and re-plug it into your Xbox 360 console.
Step 19: Host an online zombie game (this works without being host, and in public zombie matches).
Step 20: Once the zombie game loads, grab your secondary controller, and sign into the offline profile.
Step 21: You have now modded zombies on Black Ops online! With just a simple USB flash drive, congratulations!
This is for the Black Ops 1 and it will work on all the zombie maps. If you need any help then ask, The profile is the file called E0001FCAD83FF04E and the save game is obviously SaveGame there is also a notepad with all the controls. You can do Noclip, GodMode, UFO, No Target, Give yourself guns, and some more things, and it works online, after every game you need to re inject the profile onto the USB. You can also do it while you are in game then when you sign into the offline profile it will activate the mods.