Long story short: my beloved Tiny TV 2 started freezing partway through any video I played - videos which have worked fine for over a year. I figured it'd been a while since I did a firmware update, so I went through the firmware update process... and now it just boots to a black screen. It's fully charged and I can see that the backlight is on, but otherwise it's totally non-responsive.

I've also put it into DFU mode (holding the Reset button + tapping Power) and I can update the firmware using the "manual update" process, but when the updater says that the Tiny TV should reboot, it briefly restarts and re-mounts the RPI-RP2 partition but otherwise is just hung on the backlit-but-black screen again.

What do I do now?

I'm in the same jam with my Tiny TV 2! When I power it on, the backlight illuminates but nothing is onscreen. Connecting to my PC shows the internal RasPi partition with the same two files you noted, but it doesn't show up in the Updater tool and the internal SD card doesn't appear either. How do I get my gadget back to normal??