Phones stuck in boot loop, probably corrupted ROM

I have an AT&T note 4 and the other day it just started boot looping. I asked a more knowledgeable person and he said that my rom was probably corrupt and directed me to xda for help. What I've done so far:
I downloaded the drivers,
I downloaded odin,
I downloaded the stock AT&T 4.4.4 ROM,
I connect my phone in download mode to odin,
I find the ROM,
I hit start and then it fails..

<ID:0/003> Odin engine v(ID:3.1100)..
<ID:0/003> File analysis..
<ID:0/003> SetupConnection..
<ID:0/003> Initialzation..
<ID:0/003> Set PIT file..
<ID:0/003> DO NOT TURN OFF TARGET!!
<ID:0/003> Get PIT for mapping..
<ID:0/003> Firmware update start..
<ID:0/003> SingleDownload.
<ID:0/003> aboot.mbn
<ID:0/003> NAND Write Start!!
<ID:0/003> sbl1.mbn
<ID:0/003> rpm.mbn
<ID:0/003> FAIL! (Auth)
<ID:0/003>
<ID:0/003> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

I've gone online and some people said that the reactivation lock was on, but i don't know if there is a way to turn it off without my phone being able to boot up.

I've also cleared the cache partition and factory reset it many times.

Is there any advice or tips, or something I'm just missing? I've never done anything like this with phones before.

Thank you.

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