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Still i am unable to update to jelly bean in pakistan , PC Companion shows Already up to date , however its ICS installed in my Phone .
When it will be available in pakistan ? Any idea 
There are almost an infinite number of threads regarding these "issues". Use the search function and you will find that the update is rolled out, meaning it will not be available for everyone at the same time. Just hold on for some more time and you will eventually get the update.