JellyBean 4.1.2 on Samsung Galaxy S3

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http://androidforums.com – Hello everyone, I have a questions related to the Galaxy S3. I live in China and I bought my GS3 here. Of course like many I want to update my phone to the latest android version which is Jellybean. I should be able to update it through Kies but it's not working as Kies doesn't seem to find any update available. So my first question is: why? Is it because my phone is rooted? Is there a kind of "Asian version" of the Jelly bean that hasn't been released yet? Then I would like to know if I can install any version of the Jellybean ? Can somebody explain me how to procee (General)