You can only change CSC if your current Samsung Galaxy S III firmware has MultiCSC. But it is not true anymore with individual CSC packages for GT-I9300 and GT-I9305. Yes, no need to depend on CSC Changer and you can install CSC that you want with custom recovery like CWM or TWRP. As usual, CSC applies to Samsung Based ROM only and will not work on CM, AOSP or AOKP ROM. And only apply it if you know what you are doing…

Multi CSC packages for Samsung Galaxy S3
Installation guide ~ How to install update zip with ClockworkMod Recovery on Samsung Galaxy S3? (Video)
Download individual CSC packages for Samsung Galaxy S3 here.
Tags: Android, CSC, Samsung Galaxy S3
Hi Jeff, correct me if I’m wrong. The CSC for Malaysia is XME right. I dont see this CSC in the XDA forum for I9300 but there’s one for I9305.
Can the one for I9305 be used for I9300 (I’m using S3).
Thanks