Things You'll Need
Instructions
Download the Launcher Files Holder to your computer. Unzip the PSJ Files from the Launcher.
Transfer the files from your computer to a USB flash drive.
Insert the USB into the PlayStation 3 with 3.70 firmware and install the prompted update. The PS3 is now jail broken.
Start up the now jail broken PS3 normally with an online connection. Delete the "Modern Warfare" patch from the game data folder. Start up "Modern Warfare 2."
Download the patch and wait for it to install. Hold the home button on your controller and select "Quit Modern Warfare 2." Turn off the PS3 and unplug the power adapter.
Start up your PS3 with your jailbreak method. Select the "Game" tab and start the PS3 FTP server.
Run FileZilla on your PC and navigate to "dev_hdd0," then "game" followed by "BLUS30377." Go to "User Directory" and choose your patch file. Drag the patch from the desktop to FileZilla and replace the patch on your PS3 with the new patch.
Go back to the PS3 and hold the home button on your controller to quit the game. Turn off your PS3 by holding the home button. Unplug the power adapter. Unplug your jailbreak device from the system and plug the power adapter back in. Start the PS3 and load "Modern Warfare 2."
Select split screen and start a match.