I'm sending you a link. As long as you're using CID 52 there should be no problem. XS++ updatesthe phone for you automaticly to CID 52, and if not, there is a way to update manually to.
http://www.topsony.com/forum/unlocki...tor-t6329.html
No, you don't need he region firmware, only your main firmware. I think you should use the file you used to flash your phone as the main firmware, it's an *.mbn, right?