1. Load Mutiman Scroll Over To MMOS Click It After Scroll Up To PS3 Root Click That
2. Now Select HDD0 Then Game Then BELS0354 Sorry I Don't Know Your Region So You Have To Check AYour Case
3. Now Select USDIR Then English Or If Your French Then The French Folder After Open Another PS3 Root This Time Select USB
4. Now Find Your Modded Patch.ff From Your USB & Press 0 Then Click Copy Now Go Back To HDD Root & Delete The One From In There
5. Now Press 0 & Paste The Modded One In Exit Mutiman Go On Worl At War Zombies You Should Have A Mod Mneu If Your Game Freezes
Then Get A New Zombie Patch Orr Buy New Disc Or Clean Your PS3 Hope This Helps