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Is it still possible to put a hacked patch from a 3.55 PS3 to a 3.66 PS3 using data transfer by connecting the two PS3's with an ethernet cable? If so, is there a way to do that without two PS3's? There isn't any kind of software that can access your PS3's Game Data Utility database?
I miss hosting challenge lobbies a lot

I don't want to jailbreak my PS3. I just want to be able to host challenge lobbies again. And if this is true that you can transfer a patch using the data transfer option, then why haven't I seen any challenge lobbies online on MW2?