Hello, I have been trying to activate codes for call of duty black ops zombies but nothing has worked I have tried all code downloaders and managers with Gecko OS but it doesnt work so i was wondering if there is anything that I am doing wrong I have also used Ocarina. I am doing the following - downloading codes from accio hacks - turning them into GCT. files - activating them on cheatby pwner4499 - Cheat Codes