Instructions
Insert yourFlash drive into one of the PS3's universal serial bus (USB) ports. These are on the front of the console.
Navigate to the "Game Menu."
Navigate up to "Game Data Utility" and press "X."
Highlight "Call of Duty: Modern Warfare 2" and press "Triangle."
Select "Delete" and confirm your decision. Deleting the corrupted profile is necessary because, by default, the game reads the profile stored on the console. With the profile deleted, it will pull data stored on your Flash drive instead.