Using an itouch with 4.2.1 (8C148) and an iphone 4.2.1 (8C148) on XCode 3.2, showed this warning. Tried installing Xcode SDK 4.0 (which looks really cool but ultra confusing) but iphone showing same thing in organiser? Any thoughts? Went from 11am to 6pm on this yesterday and know I’ve missed something really basic. Any help very very appreciated.
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Try modifying your Deployment target to 4.2. By default, it will usually attempt to target the latest version.
If you’re in XCode 4, click on the Application Name at the top of your left navigation pane, which should take you to the project task settings. On the Info Tab, you’ll see “iOS Deployment Target”. Mine defaults to 4.3.