Instructions
Turn on the PlayStation 3 with the "Call of Duty: Modern Warfare 2" disc inserted into the console.
Navigate to "Game Data Utility."
Search for the patch you wish to delete. If a game previously worked and is now experiencing errors, it is likely the most recent patch that negatively affected your game. Scroll down to the last patch that was installed. Select information to verify the size and date of the patch to ensure you have located the correct patch.
Select "Delete" to remove the patch.