So basically you can only use this on your own lol? unless you happen to run into someone with the same patch that you have on. Haaaaaa, gay!
Anyways on a side note, are there infections on it? Like for example, can we get UAV and Aim assist but use it online without using the .ff?
The post that Choco posted, I ran into while doing this for MW3 (PC). If the host files checks the client data, you have two choices. You can spoof that data or disable the checks that gives the errors. If the host and client both cross-check, you have to spoof the host file, so the un-modded client thinks it's legit. Obviously the host is the one who can mod files so they too would have to spoof or disable checks.
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Dunno if this would work for PS3. Seems like it would.