Heyy TTG Coming at you with a text tutorial.

Files required to the Mod:
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Text Tutorial:
Step 1: Download the files above.
Step 2: Open up Horizon, and change the ID's on the offline profile that I have provided, to your ID's.
Step 3: Save, rehash, and resign the offline profile.
Step 4: Open up the savegame.svg that I have provided in Horizon.
Step 5: Change the ID's on the savegame.svg, to your ID's.
Step 6: Save, rehash, and resign the savegame.svg.
Step 7: Inject both the offline profile, and the modded savegame.svg into your USB flash drive.
Step 8: Load up Black Ops.
Step 9: Plug your USB flash drive into your Xbox 360 console.
Step 10: Select the USB flash drive as the storage device.
Step 11: Go to campaign, and press resume.
Step 12: Once the campaign game has loaded up, get a secondary controller, and sign into the offline account.
Step 13: Click the back button on your main controller, and then leave the game.
Step 14: Sign out of the offline account, on your secondary controller.
Step 15: Start up a solo zombie game on your main controller.
Step 16: Once the game has started, click the back button, and then quit.
Step 17: Un-plug the USB flash drive from your Xbox 360 console.
Step 18: Plug the USB flash drive back into your computer.
Step 19: Re-inject the offline profile into your USB flash drive.
Step 20: Unplug the USB flash drive from your computer, and re-plug it into your Xbox 360 console.
Step 21: Host an online zombie game (this works without being host, and in public zombie matches).
Step 22: Once the zombie game loads, grab your secondary controller, and sign into the offline profile.
Step 23: You have now modded zombies on Black Ops online! With just a simple USB flash drive, congratulations!

I AM NOT RESPONSABLE FOR ANY BANNINGS OR ANYTHING LIKE THAT