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I just installed the latest iPhone SDK 3.0. After I seleced the active SDK as Simulator 3.0 at the drop down overview, the “target” field no longer shows me the 2.2.1 SDK, and defaults to 3.0, resulting in I cannot test on my 2.2.1 device.
What actions should I follow to fix this? Even in the target property my base SDK still appears as device 2.2.1.
You cannot run an iPhone application compiled for 3.0 on a device running anything other than 3.0 as it is not backwards-compatible with 2.2.1. You’ll need to upgrade your device in order to run 3.0 apps on it.
More specific to the most recent release of the SDK, there is an entry in the release notes that states that this version does not let you compile against any SDK except the 3.0 SDK. I believe the last version that allowed you to do that was 3.0b2. You’ll need to roll back to that one or earlier if you want to compile using the 2.2.1 SDK.