I think the issue is bigger than just my TV's resolution limitation though... I really don't think the ROM is loading properly. When I power on the stick, I see Amazon logo for five seconds --> blank screen with only giant mouse cursor showing. And no matter what keys I press on a USB-OTG keyboard, the only keys that do anything are volume up and down, which show a scrambled volume-level notification on screen. Shouldn't I see more than just the blank screen/shouldn't other buttons ('Home' for example) make something happen on the screen?
Here is a video:
https://1drv.ms/v/s!Ak9IJJyqB1Y1o2AKXd8Nej19PHkY?e=fflMmW
Edit: the "Tab" key makes a key-press tapping sound, but that's it!