The best you can do is get a used 1st / 2nd generation iPod / iPod - they can be updated and reduced to a minimum and better tested than a simulator.
But if you want to test with the old SDK anyway, if you have a disk image with the old SDK, you can install the previous SDK in a place other than the default directory /Developer(for example, something like /Developer3.2), then open your project in a copy Xcode c /Developer3.2/Applications.
I don’t know if there are any negative consequences from this, but I often install beta versions of the SDK on /DeveloperBetafor testing and do not encounter any problems.
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