[Q] Note 4 boots to download mode but Kies and Odin can't detect it. Hard Bricked? topic

I've rooted and flashed ROMs on three previous android phones but I still consider myself something of a noob.

I have a SM-N910T that I've had for a couple of months. I was trying to flash TWRP for the first time. Windows detected the phone (as it always has in the past) and Odin detected the phone. Halfway through the download the process failed and Odin threw up an error message.

Now I get 'Firmware upgrade encountered an issue' with a straight boot. I can boot into download mode on the phone but neither Windows, Odin, or Kies can detect the phone as far as I can tell. There don't appear to be any 'unknown devices' in Device Manager. I've tried different usb ports, different cables, and tried both my laptop and desktop (both are 64-bit windows 8.1) with multiple reboots.

I'm assuming from this point that the phone is hard bricked, but I wanted to see if anyone more knowledgeable had any ideas or input.