I am siding with Aiyo on this one, I used the compatibility patch after a full restore, jailbreak, and installation of Installer and it caused nothing but headaches, the phone would constantly freeze and was very laggy. I finally managed to uninstall the patch and presto all the problems went away.
The best way to workaround the version issue is to go into your core services and change a plist file that contains your system version number.. say if you have 1.1.4, you just change the string to 1.1.3
Go Here for the Plist Change -
http://www.modmyi.com/forums/showpos...71&postcount=2
It doesnt mess things up like the patch, which oddly disabled Edge data, made the system version info and bluetooth "not available" as well.
Stick with just changing the plist, its the safer way.