Getting "Unknown iOS Detected" everytime in Xcode Organizer when I connect my device iOS 4.2.1

I get the same screen everytime I connect my device to the Mac.

This thing started happening after I installed iOS 4.2.1 on my iPhone.

It takes several minutes each time to recognize the device when I connect it to Mac.

What can be a permanent fix?

EDIT:

My iOS SDK version is 4.2.1 and My Xcode version is is 3开发者_如何学运维.2.5.

I deleted the developer tools and Xcode and then reinstalled it again.

Then collected the symbols for the first time. Then it worked properly from second time onwards.

Hope this helps

What maximum iOS version supports your xCode? You should update it to support the latest iOS version.

As pictured in your screenshot, your device looks to be on 4.2.1. What version of Xcode are you using? You should be using the latest 3.2.5 with iOS 4.2.1 SDK.

If you are not on Xcode 3.2.5, then upgrade to that.