Does an app that made with ios sdk 4 install on device with os 4.2 ?
I made an app with ios sdk 4.0.1 but now i want to install it from xcode on ipod touch with os 4.2 but says No provisioned iPhone OS device is connected.
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Yes. You can run Applications for previous versions of iOS on a device with iOS 4.2.
The other way around might not be true: you may not be able to run applications compiled specifically for iOS 4.2 on devices with previous versions of iOS.
Keep in mind that with iOS 4.2 SDK you CAN create applications for devices running lower version of iOS also. It depends on how you configure your project on info.plist and the APIs you use in your application.