Please Go through the Apple's Documentation for More Details.
The above Apple's Link contains explanation of what I am displaying in crash reports settings image and how to use crash report to symolicate the hexadecimal values.
Now the following things you should take care to generate crash report while building your application.
In xcode project navigator click on your project and then click on the Build Settings. When you archive your application, xcode uses the release Configuration by default, you will want to set the following values for the Release Configuration only..
Ensure the following values are set for Release Configuration.
Once these values are set, Archive and reinstall your application.Now crash reports are generated from the resulting archive should be symbolicated.
This is specifically for xcode 4.
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