How to update my software to 4.3 ios from 4.2.1

ive had an iphone 3g given to me by a friend, ive tried to downlaod apps like facebook but it says i must update the software to IOS 4.3, i have gone through the general settings and it doesnt give me the option to update it, i have also tried on itunes (even updated my itunes to the latest version) and it says my phone is up to date with the 4.2.1 version, but still wont let me sync any apps i have downloaded, ive also restored the phone back to factory settings and it still wont update, are there any other ways?

Sorry, but you can't. iOS 4.2.1 is the last version of iOS your iPhone 3G will run. If you need to run apps that require a newer version of iOS, you'll need a newer iPhone.
Regards.

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