HT201210 i have iphone 3gs with ios 4.2.1 i need to update to ios 5.1.1 its possible?

hello,
i try to update my iphone to ios 5.1.1 but i get an error message
isit possibe to update to old ios like "ios 5.1.1" or
i can also to update to the last ios 6.0.1 ?
if i can , How can i do that.
thanks alot.

An iPhone 3GS can go to iOS 6.0.1, the latest available iOS. and you do that via iTunes. You need iTunes version 10.7
iTunes 10 for Windows: Update and restore software on iPod, iPhone, or iPad
However, the iPhone 3G can only go 4.2.1.
Identifying iPhone models

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