HT4972 how to update iphone 3GS version 4.2.1 to IOS 5

how to update iphone 3gs version 4.2.1 to IOS 5

If a 3GS, follow the directions here:
http://support.apple.com/kb/HT4972?viewlocale=en_US&locale=en_US
If an iPhone 3G, it can't be updated beyond iOS 4.2.1...that's the end of the line for that model iPhone.

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