Hi frnds, i am using iphone 3gs, i want to know how can i update my iphone to ios 4.3.3

hi frnds, i am using iphone 3gs, i want to know how can i update my iphone to ios 4.3.3 or any other ios.

Please note the iPhone 3G can not be upgraded beyond 4.2.1.
If your iDevice is using a version of iOS lower than 5, you will need to use iTunes on your syncing computer to perform the upgrade. Use the Apple link below as a guide for the upgrade.
http://support.apple.com/kb/HT4972
Also read the instructions from the section entitled "Update your device using iTunes" at the link below.
http://support.apple.com/kb/HT4623
Information regarding transferring purchases from your iDevice to iTunes on your syncing computer can be found at the link below.
http://support.apple.com/kb/ht1848

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