I am using iphone 3gs n i wanted to update help me out how to do....?

i am using iphone 3gs n i wanted to update help me out how to do....?

To update
 your iPhone:
Be sure you have iTunes 10.7 (11 will be released soon)
Plug in your iPhone
Go to the iPhone summary screen
Hit "update"
If the update fails
Go on your search engine and type "iPhone 3GS firmware GSM" or "iPhone 3GS firmware CDMA" and download the latest firmware from there.
Place the downloaded firmware on your desktop or in your downloads page
Go back to the summary page
Hold Shift and click update
Find the firmware in your saved location
A question will pop up asking if you want to install the firmware

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