Can I update my first generation iPhone

Hi! So I have the first generation iPhone (like the first to ever come out) and it doesn't do software updates in settings. I need at least the IOS 4.3 update to download instagram
in the app store. I really want to get this! Can I?

Hell no

No, You can't update your first generation iPhone. It is not compatible with the iOS 4.3

Try this: www.mobile-incredible.com

No - The latest version you can run is iOS 3.1.3.
It's impossible to go any higher than that.

Software update in the settings is a feature of iOS 5.To update iPhones running anything less than iOS 5, you need to connect it to a computer running iTunes.