Softbricked SM-G955U | Need Help

Let me start this by stating what I know.

The model no is SM-G955U
Carrier is US Cellular
I am using the OEM cable
I do not have the serial number
I cannot unlock the bootloader.
USB Debuggin is enabled.

I tried rooting the phone a while back, I can't remember what tutorial/rom.
I ended up softbricking it then, I just used ODIN to flash the stock firmware, and it fixed itself.

I was trying to use this tutorial:
[V2][Update][Root][G955U]PartCyborgRom - SamFail Rooted/Debloated/Audio/More
(Can't post link because I am a new user"

To root the phone.
I was following the tutorial to the T, USB 2.0, AP first. It failed, without saying "Unknown error", I tried redoing it. Same thing.

I downloaded the stock firmware to fix it, and it still failed.

Now I get a blue screen with a cautionary symbol, and the words:

"An error has occurred while updating the device software. Use the Emergency recovery function in the Smart Switch PC software."

I tried this method, however, I do not have the serial number, so I cannot use this method.

I am running out of ideas, and I need my phone back soon. Any suggestions will help.

This is what Odin3 v3.12 says:

Added!!
Enter CS for MD5..
Check MD5.. Do not unplug the cable..
Please wait..
Checking MD5 finished Sucessfully..
Leave CS..
Odin engine v(ID:3.1203)..
File analysis..
SetupConnection..
Initialzation..
Erase...
Get PIT for mapping..
Firmware update start..
SingleDownload.
system.img.ext4
FAIL! (Auth)

Complete(Write) operation failed.
All threads completed. (succeed 0 / failed 1)

— modified on Apr 5, 2018, 5:33:09 AM