How to unroot the Nexus S 4G back to stock Android 2.3.7

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This video will show you how to unroot / unbrick the Nexus S 4G. It puts you back to stock Android 2.3.4, then will OTA to Android 2.3.5, then 2.3.7! If you do this, nobody will be able to tell you ever rooted. Any questions, please ask!
Links:
Drivers:
One click unroot:
IF YOU WANT TO GET BACK TO ICS INSTEAD OF GB, USE THIS FILE:
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