Ensure the Media ID of your Title Update matches the Media ID of your game version. Troubleshooting Tips
This is the default "Global" folder for all games. Call of Duty Black Ops [Jtag/RGH DLC]
This is a popular homebrew tool used to scan your drive for DLC and XBLA games and "Unlock" them with a single click if they show as locked (blue padlock icon). Ensure the Media ID of your Title Update
This version is notoriously difficult on RGH consoles. It often requires specific "Compatibility Packs" found in the 00000002 folder to reach the main menu. Jtag/RGH Tutorials #5 Installing DLC Call of Duty Black Ops [Jtag/RGH DLC]
DLC for Black Ops games will appear in-game unless you have the correct Title Update active.