NVIDIA Shield Unlock Bootloader FAILED

Good afternoon-
I recently picked up a NVIDIA Shield from a friend of mine because it would not turn back on for him. It is currently stuck at the NVIDIA Boot screen. I can access the Bootloader and I can access stock recovery. However, when I attempted to use Fastboot to unlocked the bootloader I receive the below...

(bootloader) Showing Options on Display.
(bootloader) Use device keys for selection.
(bootloader) erasing userdata...
(bootloader) erasing userdata done
(bootloader) erasing cache...
(bootloader) erasing cache done
(bootloader) unlocking...
FAILED (remote: ()
finished. total time: 3.872s

I am using "Fastboot OEM Unlock" and it does prompt me on the Shield to unlock, but once I select unlock it bounces right back to the bootloader and fails. I tried wiping data and factory reset via stock recovery, but when I do I receive an E: Failed to Mount /Cache (Invalid Argument). It will not let me read/write any of my user data files at all. It seems as if they are corrupt, but I am not quite sure.

I am looking for a way to get this thing back up and running. I am perfectly fine with losing all data on it. Is there a stock kernal that I can flash with a locked bootloader? I fear the issue is with the bootloader or corrupted EMMC. I am open to any and all suggestions!