Is there any way to upgrade an iPhone 3g to iOS 4.0 on iTunes 10.6?

I recently got a hold of an iPhone 3g as a temporary replacement until what many hope to be the next iPhone. My Blackberry died today. (RIM, you suck.) Now, I recieved it with iOS 4.3 installed and after a quick restore in DFU, I am now stuck on iOS 3.1. -__-
I've been trying to find a way to upgrade it back to at least 4.0, but iTunes 10.6 doesn't seem to recognize the upgrade. Any help!?

No. Downgrading has never been supported. Why do you believe you "need" to do it?

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