[tatteredscroll]

This was new...I forgot this had a front button (laying it down on the front with the back open, I didn't think much about it), but I pressed the front button (fingerprint scanner) just after a reboot and saw this:

[6420] dload mode key sequence detected

I no longer see the blue power light. And pressing power button no longer gives me this

Android Bootloader - UART_DM Initialized!!!
[60] disable otg power
[560] Going down for shutdown.

So there seems to be at least two states. When it bootloops, if I press and hold power down long enough, it "powers off", the light goes off and it no longer sends output to the console. However, pressing power button quickly in this mode or state yields the above "Android Bootloader - UART_DM initialized!!!" message.

But pressing the front button at the right time (after it reboots itself from bootloop) I get put into some kind of downlod mode:
[6420] dload mode key sequence detected

And it seems to be frozen, unresponsive. Connecting to USB on my laptop doesn't yield anything in the console, but I get a blinking red light. I've been here before with charging. Seems a long press on power pulls it out of this and it's back in bootloop.

I also noticed that with a long-press of the power button at random places in the boot cycle. Because everything is scrolling so fast, I'm not sure at what point this is being triggered or how long power needs to be pressed to trigger this message.

========> Power Key Down