You can find out which country is for your firmware by searching your Customization Number.
You must enter in the Service Menu by pressing "*#*#7378423#*#*" (*#*#SERVICE#*#*) in the phone dialer, and after tapping "Service Info" - "Software Info".
After that, you can download from this topic: http://forum.xda-developers.com/show....php?t=2608983
"Xperia update Checker".
With that software, you can check the last firmware for a specified Customization number, but also check which country and which carrier your firmware is for!
Hope it helps!