I've got a Iphone 3 G with IOS 4.2.1 .I would like to make an Upgrade to IOS 4.3. or better. How can I o it?

I've got a Iphone 3 G with IOS 4.2.1 .I would like to make an Upgrade to IOS 4.3. or better. How can I do it?

The 3G was discontinued almost 3 years ago. 4.2.1 is the end of the line for it.

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