There is no software update in y iphone 3gs, version 4.0.1. how can i upgrade to ios 4.3?

there is no software update in y iphone 3gs, version 4.0.1. how can i upgrade to ios 4.3?

http://support.apple.com/kb/HT4972
This procedure will upgrade the phone to the most recent version (6.1)

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