Need Odin root for SM-T807A (ATT)

I picked up a used tablet with a broken screen and managed to get some parts swapped out and get it booting.. but it hangs at the boot logo.. The original donor was supposed to have been rooted but may have been soft bricked.

Thinking I can odin the kernel and OS to the latest version (or even stock ATT kernel and OS).

I downloaded/installed Odin 3 v1.85 and the pit that comes with it is u1_02_20110310_emmc_EXT4

anyone have a pit and bin or tar that I can use to either reload to stock or better yet, load the latest/best kernel and version of android. I'd prefer root, but I'm ok with stock/clean wipe/reload of everything.

I can get it to boot to download mode if there's another way in (download.zip?).. but I can't get into the OS to do anything other then 'factory wipe' and it just hangs at the logo. (waited for a day)

I've never used this type of tablet before (familiar with the nexus, note, etc..) so maybe it's even hardware locked. Appreciate any input you can offer. The tablet is a Frankenstein of parts or I'd take it in for service.. pretty sure that's not covered under warranty..

I need stock firmware from ANYONE SM-t807A it does not exist on the web.

I have spent days looking, turn on goes to kies firmware screen yet when i put in the model and s/n it shuts and the new samsung app to replace kies is of no help. I can get to the download screen and odin shows it up but no ATT 10.5 Tab S Sm-T807A firmware ANYWHERE.

Please help this is a very very expensive paperweight and im not affiliated with ATT so them helping me is out of the question.