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I’ve been putting off installing the 3.0 beta SDK in case I can’t make apps to target 2.0. If I install 3.0 on my computer and iPhone, will I still be able to submit apps to the app store for users with 2.0 iPhones to download? Will I have to wait until 3.0 is released to submit more apps?
Actually, I suggest testing on OS 3.0 as it’s a requirement your app doesn’t break on the new OS.
You can still build for 2.* but I can see how testing on only one device can make you nervous. There is no way to rollback to a previous OS once 3.0 has been installed. So, if this device is also your everyday cell phone, make sure you accept possible bugs. (though I haven’t heard of any seriuous problems. OS 3.0 is worth it)
As for the issue you address. Apple says:
I think they didn’t express themselves too well. While technically spoken, they are right, you just have to select SDK for 2.2.1, and you’re good to go.