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Ok here are the steps on how to bypass mw3 update 1.22 down back to 1.21. This is so you can join xp lobbies host them, etc.
Here are the steps:
1. Delete mw3 game data(patches)
2. Start the game up(mw3)
3. You will have to update to 1.22 so start the download.
4. There will be 4 parts to download 1/4, 2/4, 3/4, and when 4/4 gets to 20% cancel the operation.
5. Then use elite mossy's patchblocker, if you dont have this, search elite mossy's patchblocker and download it (takes like 10 sec. )
6. Go to network settings, any connection works (wired,wireless) go to proxy server and put in the info that your blocking with elite mossy's patchblocker.
7. Dont Test Connection!!, if you test connection it will not work!!
8. Start the game and play mw3
If this helped you dont forget to thank this post and hope this helped you guys and if I didnt pm me and tell me what you did.
This Is Confirmed Working!!! 
BJ:
Ill keep you guys updated on this as much as possible