Can you unlock map packs or not on ps3

you cannot unlock the map packs however after completing the storyline the zombies level "five" is unlocked another way to unlock five is by escaping the chair at the main menu by either pressing L2 R2 repeatably until you escape the chair then go to the computer behind you and enter in the code 3ARCUNLOCK all caps no spaces and it will unlock five faster then completing the storyline this will also unlock the DOA zombies minigame