iPhone 3GS: can I upgrade to iOS 4.3 or 5 ?

[cellulartalk]

I use an iphone 3GS, has iOS 4.01 (jailbroken) on it. Has been serving it's purpose fine so don't feel the need to buy a more updated version (cheap ******* vs. pragmatic, who knows !). However, now I can't upgrade most of my apps because everytime I try to update an app it says "sorry you need...

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