Support upgrading android 4.0 ICS to 4.1 jelly bean

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http://androidforums.com – Hi Guys, I recently bought Samsung galaxy S3 which is running Android 4.0 ICS. I want to upgrade it to 4.1 Jelly bean. Well, I know how to install it once setup is on SD card but I dont know where to download the setup from :confused:. This may sound stupid to you but I really spent lot of my time searching on web as how to download the jelly bean software form internet?? Can anybody please help me on this? Thanks in advance. (General)