Hi im TTG-Fish.
By the way you will need a usb
*Delete the patch from system setting > Memory > Games > Blackops > Delete patch
Things you will need : Modio [ Register or Signin to view external links. ]
A USb Drive (Flashdrive) With at least 4 Gb
Zombies Modification (41560855.gpd) File
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1) Turn off xbox and switch it back on again
2) Sign out of your xbox live account
3) Make a new account call it (BlackOpsModz)
4) Go to System Setting
5) Go to memory
6) Go to Hard Drive
7) Go to Games
8) Go to black ops
9) Delete system patch/update
10)Press B Twice
11)Go to gamer profiles
12)Move (BlackOpsModz) to your USB
13)Plug USB into computer
14)Open up Modio
15)Click on explore a device
16)Click File
17)Open/Close Device
18)Keep opening them till you get something like E000
19)Move the E000 File to desktop
20)Go to Modio "Main"
21)Click on Open a save
22)Load the E000 save (Your profile)
23)Go to file contents
24)Replace the .GPD file with your modded file
25)Go back to General File Info
26)Rehash and resign
27)Go back to Explore a device
28)Then right click the E000 file
29) Delete the file
30) Then right click and insert file
31) Then put in your modded profile (E000)
32) Remove USB
33) Plug into xbox

*Note(s)* If you switch off your xbox after you inserted the
modded file into your xbox it will wipe the mod
(Which means you have to reinstall the modification)
You have to remove the patch or the Modification
Wont work.

Have fun Remarks go to Michael Lamont (TTG-Fish) On behalf
of SOLO Gaming and community and the founder of SOLO
gaming (Michael Lamont).
Here is the video <3