Help with unrooting and returning to stock

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http://forum.xda-developers.com – Hello. Let me start by saying I am not new to Android, but totally clueless when it comes to Samsung. I have owned a few HTC handsets and have become fairly comfortable with all things root on those devices. So I have an understanding of how things work, just having some trouble trying to unroot and return my gf's E4GT to stock. Some background: my gf got the phone from a coworker and it was already rooted. She didn't know this until she tried to accept the OTA update a few days ago. Of course, upon reboot, it went to the ACS recovery screen. A simple reboot and the phone is running...j (HowTos)