Flashing ROMs

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http://forum.xda-developers.com – So what is the differences between the same version releases for different countries? Why can't it be just one firmware for all? Also, if I wait for the JB OTA from my carrier I wouldn't need to worry about changing the CSC, right? So CSC will just make sure that the firmware you are flashing (from another country) will be transformed to your own country, is this correct? Lastly, is it always recommended to factory reset data of your device BEFORE and AFTER flashing via Odin? (HowTos)