How do i upgrade my iphone 3gs from 3.1.3 to latest firmmware?

Here is what i've done so far.
Downloaded the latest Itunes
restarted computer
Backed up my iphone
downloaded the latest firmware(4.3.5) from ios 3.1.3
pressed update
it gets as far as the beginning of the installation and displays an error:
"The Iphone could not be updated. An unkown error occured (3194)
Thanks in advance

You need to reset your iPhone in DFU mode, check this out: http://www.iclarified.com/entry/index.php?enid=1034
Then you should be able to upgrade.

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