Update iPhone 3gs from ios 4.1 to ios 6.1.3? Also need to unlock after update!!

I

iMore Question

iPhone 3gs - Current ios 4.1 - Jailbroken - Baseband 06.15.00 - Model MC637b

Dear,

I would like to update this phone to 6.1.3, and after updating I would surely have to jailbreak and unlock it, to run carrier sim. But, unfortunately, after googling for hours am unable to find any suitable guide for updating.

Please, help if you have working guide or solution.
 

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