[Guide UPDATED] How to Unroot your AT&T Galaxy S3 (Return To Stock I747UCDLK3 JellyBean )

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Re: [Guide] How to Unroot your AT&T Galaxy S3 (Return To Stock)

Here's the Odin log:
<ID:0/010> Initialzation..
<ID:0/010> Get PIT for mapping..
<ID:0/010> Firmware update start..
<ID:0/010> aboot.mbn
<ID:0/010> NAND Write Start!!
<ID:0/010> FAIL! (Auth)
<OSM> All threads completed. (succeed 0 / failed 1)

I am using SAMSUNG_USB_Driver_for_Mobile_Phones_v1.5.25.0-retail.exe instead of SAMSUNG_USB_Driver_for_Mobile_Phones_v1.5.4.0.exe since it appears to be a later version.

Please advise as to what I might be doing wrong.

Thanks for any assistance.

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[MSTACE]

<ID:0/006> Odin v.3 engine (ID:6)..
<ID:0/006> File analysis..
<ID:0/006> SetupConnection..
<ID:0/006> Initialzation..
<ID:0/006> Get PIT for mapping..
<ID:0/006> Firmware update start..
<ID:0/006> aboot.mbn
<ID:0/006> NAND Write Start!!
<ID:0/006> FAIL! (Auth)
<OSM> All threads completed. (succeed 0 / failed 1)

I am receiving the above error on Odin and SW REV CHECK FAIL : Fused 2 > Binary 0 on my phone. Please help!!!