Change CSC (Consumer Software Customisation Code)

To find your CSC code, go to the dial pad and type in:
*#1234#
PDA - build version of the firmware
Phone - the baseband/modem version
CSC - specific to geographical region and carriers. It contains the software packages specific to that region, carrier branding and also APN settings for data connection, MMS etc for your service provider.
Build Info - the time and date of the build you are running.

How to change CSC on Samsung Galaxy S2?

1. Get IMEI number with *#06#. Write it down.
2. Type *#272*# at Phone dial pad.
3. Select the CSC that you want.
4. Click Install.
5. Phone will reboot.