Things You'll Need
Instructions
Insert the USB drive into the appropriate PS3 slot. Insert a copy of the game. Look under the files named "Game/Saved Game," followed by "Utility/Call of Duty File."
Press the triangle button on the PS3 controller and the prompt reading "Save to USB Drive?" appears. Select "Overwrite" followed by "Yes" at the prompt. Wait a few seconds for the file to copy to the drive. Afterward, insert the USB drive into a computer.
Right click the Copy option in the drop down box and copy all information from the drop down window. Then click Start/My Computer to open the USB drive. Open the PS3 file under Saved Data (it reads BLUS30072-AUTO-). Right click GPADO-MP.PRF to open the Notepad program.
Highlight everything in the Notepad text and delete it, then right click to paste the new text onto the Notepad page. Click "Save," then exit out and insert the USB drive back into the slot on the PS3 console. Follow step two to reopen the overwrite option and click yes.