How to update iphone 4s to to ios 6.1.2?

I have an iphone 4s jail broken running on ios 6.1
I have to update it to ios 6.1.2
I have tried putting it into DFU mode and downloading file of ios 6.1.2 this file =Apple Device Software Update File (.ipsw)
then clicking on restore by simultaneously pressing shift
but it gives an error iphone could not be restored, error 3194
SO how can I update my 4S
Help!

Added (1). This site is not working
it says server error or down for maintainance

<< That link should give you all the help you need in updating your "4S" to 6.1.2

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