Step 1 : first you delete your mw2 game data so it goes back to the 1.1 update instead of the 1.3.

Step 2 : Download Elite Mossys Patch Blocker - Downloads/id=1446/elite-mossys-pa...r-ps3.html

Step 3. go to Network settings on your ps3 and go through your settings till you reach proxy server and click manual. it will have you put in a I.P Address and a Port number. dont do anything yet.

Step 4. go to your computer and open Elite Mossy patch Blocker (Run as ADMIN) it will open and look like this [ Register or Signin to view external links. ]

Step 5. take the I.P that appears in YOUR ELITE MOSSY PATCH BLOCKER.. NOT THE ONE IN THE PICTURE.

Step 6. go back to your ps3. and insert it into the ip and port number box. then save settings BUT DONT TEST CONNECTION.

Step 7. click start blocking on EMPB and start mw2. if you did everything right there should be no update and you should be able to find bypass games and join bypass lobbys. Hope i could help this was my first TUT.

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Another easier way,
1.Go to settings
2. Network Settings
3. Internet Connection Settings
4. Custom
5. Go all the way until you get to Proxy Server, Say Use
6. In the Address type in, 210.101.131.231 and in Port Number type 8080
7. Go right until it says "Press the X button to save settings, press X
8. DO NOT test connection, just press O
9. Let it sign you in
10. Go to Game
11. Game Data Utility
12. Press Triangle on whichever game you want to remove the Update from, Press Delete
13. Start whichever game up and you have successfully bypassed the update.