I followed these steps to solve my problem by making Xcode to support iOS 6:
1. Xcode 4.5.dmg ( ).
2. " " .
3.
///iPhoneOS.platform/DeviceSupport/6.1 (10A403)
Mac ( mac mac . Snow Leopard Developer Finder PLACES , , Lion, Xcode.app Show Package Contents):
//iPhoneOS.platform/DeviceSupport
4. SDK iOS 6 :
///iPhoneOS.platform//SDKs/iPhoneOS6.0.sdk
Mac
//iPhoneOS.platform//SDKs
5. version.plist Contents/Developer/Platforms/iPhoneOS.platform mac Developer/Platforms/iPhoneOS.platform.
6. Xcode ().
!! Xcode iOS6, ( SDK) iPhone iOS6 ( iPhone 6.0).
How to restore iPhone to older version say 5.1 .