How to upgrade my ios 4.1 to ios 6?

II have, well my sister have a iphone 3gs that is jailbroken. She has ios 4.1 and she wants to update to ios 6.Is it possible for this to take taht action or not. Would it damage the phone or not. How can i do it? Do i need to download a software to do it? Thanks

Added (1). Duncan - Would it still work if my iphone 3gs is jailbroken already.

The iPhone 3GS can be updated to iOS 6 by connecting it to a computer and opening iTunes…

http://support.apple.com/.../kb/ht4623

No jailbreak required.

Future updates can be done directly to the iPhone without the need to connect to a computer.

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