Unable to update from 4.2.1 to iOS 4.3.3

currently i am running iOS 4.2.1 on iphone4 and tired to update it to latest version iOS4.3.3 but after downloading update for 25 min, it says
"There was a problem downloading the software for the iphone "xxx iphone". the network connection timed out".
i have done numeros times and always its saying the same. i am sure there was no internet connection lost.
Please help.
thanks,

This is asked and answered very often. The forum search bar is on the right side of this page.
Disable your firewall/security software and try again.

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