Before this i post this post I just want you to know that this is in no way my find and i take no credit 8) Credit to ox matto xo
HOW ITS DONE AND WHAT YOU DO ..



A ps3 with 3.41 (If you have updated to 3.42 then dont bother doing this)
Your jailbreak system/chip (I use my blackCat USB)
Backup Manager
FTP server homebrew
File Zilla
1.Run your ps3 in Dev mode, using your jailbreaker
2.Install Backup Manager from a USB in *Install Package File*
3.Backup Mw2 to your HDD, this may take a while!
4.Once complete, restart your ps3
5.Download a copy of FTP server homebrew on PS3 News
6.Install this homebrew in the *Install Package File* from your USB
7.Start FTP server from your games list
8.Now once you start this up, press X to start the FTP service
9.You will then see your private IP address and port number
10.Head over to your PC where you should File Zilla installed
11.Once File zilla has launched, type your HOST as your IP address as you see on your FTP server screen on you TV
12.The Username, you Type "FTPD" and your PORT is the Port number on your TV screen, you dont have to put a password.
13.Click enter and your FTP should start, you will now see your ROOT file system on your PC.
14.Head over to your root and open DEV_HDD0 and locate to your patch file,
I dont want to go into detail because I want you to figure this out yourself!
15.Replace your modded patch file into your patch folder, and then close everthing.
16.Quit FTP server on your ps3, and restart you console.
17.Start up Backup Manager and start mw2, insert another disc or the Mw2 disc.
THIS HAS BEEN CONFERMED
***
but this basically says all you need to do is get the psjailbreak and then ftp into your ps3 harddrive files and then change the .ff file where there are loads arround .
anymore info ill keep you updated.
here it allso proof this method works.


*Credit To oX-Matto-Xo on NGU for finding this out
I take no credit :p



EDIT : Now all we got to do is get arounf the new update 8)