iPad 升級到 6.1.2，Xcode 卻無法辨識，Organizer 中顯示 The version of iOS on “xxxx’s iPad” is not supported by this installation of the iOS SDK. Please restore the device to a version of the OS listed below, or update to the latest version of the iOS SDK; which is available here.

解決方法很簡單，把 Xcode 升級到 4.6 就可以了。