[Q] Soft-Bricked Galaxy S5 G900A topic

I'm new to this and I bricked my phone pretty quickly. I'm trying to return it to stock. I have the MD5 file from sammobile. Whenever I try to start the process in Odin v3.10 (I've tried other versions and other MD5 files) I get

<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> G900AUCU1ANCE_G900AATT1ANCE_G900AUCU1ANCE_HOME.tar .md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/007> Added!!
<ID:0/007> Odin v.3 engine (ID:7)..
<ID:0/007> File analysis..
<ID:0/007> SetupConnection..
<ID:0/007> Initialzation..
<ID:0/007> Get PIT for mapping..
<ID:0/007> Firmware update start..
<ID:0/007> aboot.mbn
<ID:0/007> NAND Write Start!!
<ID:0/007> FAIL! (Auth)
<OSM> All threads completed. (succeed 0 / failed 1)

I've been all over different forums trying to find any way to fix my problem but I can't get anything to work. Literally any help would be fantastic!