You will need to ROOT your phone to do this, and although this is to change to Global, you can use the codes for region if it has been released.
- XDA
Using root explorer I edited "build.prop" from within the system folder.
I changed
ro.semc.version.cust=xxxx-xxxx
and
ro.product.name=X10_xxxx-xxxx
I changed the xxxx-xxxx to 1235-9897 (World generic)
saved the settings and exited from the file.
I also changed the ro.semc.version.cust=xxxx-xxxx file in...
/etc/customization/settings/cust.prop
saved and exited.
Then I switched the phone off and on again..
Then off one more time..
Then I used SEUS...
It will say that you have the latest software (because you do!).. but if you do a repair then it will replace your current one with the one associated with the codes you entered...
and bingo.. job done..
CODES here.."customer location finger prints" - xda-developers
Obviously this only works with firmware that has been released into SEUS.
- XDA