How to completely unroot?

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trillog

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I have a SGH-I337 on 4.3, which has been rooted. However, I need to send my phone in for service to Samsung, how do I completely unroot?

I read about Odin, but I cant seem to find the 4.3 firmware for AT&Ts version of the S4... Can someone please guide me through the entire process :cowboy: