How to get iOS simulator running iOS 3.0?

I am currently using xcode 4 and the iOS 4.3 SDK and I need to test my app in the simulator us开发者_C百科ing the 3.0 OS but the earliest I can get is the iPad 3.2 OS.

How can I get the simulator to run older versions of the iPhone OS?

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AFAIK you can't. You'd have to be using an earlier iOS SDK version (and FYI, you can have multiple SDKs installed on your machine - just move them to a different folder when you're installing a new one).

See this question for more details.