Xcode 4.2 support iOS 5.1

Xcode 4.2 only support up to iOS 5.0 ，but the following method can allow you to run iOS5.1 in Xcode 4.2.

Download Xcode 4.3.1 dmg first, and then :
1. Copy folder

    copy /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/5.1 (9B176) to
   Developer/Platformes/iPhoneOS.platform/DeviceSupport

   command：

   sudo cp -Rpvn "/Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/5.1 (9B176) " 
/Developer/Platforms/iPhoneOS.platform/


2. Copy folder

    copy  /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk to
    Developer/Platformes/iPhoneOS.platform/Developer/SDKs

    command:

      sudo cp -Rpvn " /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk " 
/Developer/Platforms/iPhoneOS.platform/

3. Copy folder

     copy /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk to
     Developer/Platformes/iPhoneOS.platform/Developer/SDKs

  Command:


sudo cp -Rpvn " /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs /iPhoneOS5.1.sdk " 
/Developer/Platforms/iPhoneOS.platform/

4.  Copy version.plist

     sudo cp -n  /Volumes/Xcode/Xcode.app//Contents/Developer/Platforms/iPhoneOS.platform/version.plist /Developer/platform/version.plist /Developer/Platforms/iPhoneOS.platform/version.plist

5. restart Xcode

Now it will support iOS5.1 debug in Xcode 4.2