So... Kind of went through this forum again and re-read everything. Bob2018's method worked for me this time. When I first attempted, I was not pushing the power button, but rather the reset button (duh).
So to factory reset, here are my official steps that worked for me reliably over multiple attempts:
1.) Vehicle is off and SD card is inserted.
2.) Enter vehicle and power on auxiliary (foot off brake, depress "ENGINE ON" button).
3.) Wait for UTR to begin recording.
4.) Press and hold the translucent (lights up in red) LED button for over thirty seconds. Actions appear to take place prior to this, but make it 35 seconds to be safe.
5.) System will reset and then begin recording.
6.) Connect to the UTR's default SSID of AUDIUTR and enter password 1234567890.
7.) There is NO password field validation in the app. IT WILL ACCEPT PASSWORDS THAT LOCK YOU OUT. DO NOT USE SPECIAL CHARACTERS IN YOUR PASSWORD. DO NOT USE LESS THAN EIGHT (8) CHARACTERS. Proceed to change password (and SSID if desired) following these guidelines.
8.) See you on the streets!