Adding SDK-specific frameworks to Xcode. Iphone OS Version 3.0.1 (7A400) - not supported by latest versio. Questions containing 'xcode sdk downgrade' Forum iPhone, iPad & iPod Touch - iPhon.fr / Problème pour synch. Use XCode 3.1.2 to build SDK 3.0 app to 3.0 Device without provi. The trick to skip Provisioning Profile for the new XCode 3.1.3 (iPhone SDK3.0) does not work now.
The only thing you can do is to use the old XCode 3.1.2 What you need is to install the new iPhone SDK 3.0 (XCode 3.1.3) in a new directory (non-default dir) <New XCode Dir> and copy the SDK3.0 and the necessary device support files to XCode 3.1.2 and use it build app to 3.0 device.