Dont pay to get in to a modded zombie lobby!!!! They are so simple to do yourself. All you need is a transfer cable or a flashdrive and modio. Just download any of the modded gpd off of TTG then follow the following instructions...
1. When in modio dont click replace file click inject file into current folder.

2. rehash and resign (Obviously)

3. When loading up black ops make sure your signed out of any accounts

4. also make sure your ethernet is unplugged.

5. when your at the main menu sign in to your modded profile offline.

6. go to zombies and start a solo game. (The mods will now work)

7. plug your ethernet back in and connect to xbox live.

8. end the solo game go private match and have fun.

If this helped you plz thanks the topic.