I haven't tested it out, but I will in just a moment. Edit: Out of the box, it doesn't seem to do anything at all without a microSD card with a valid bootloade

I haven't tested it out, but I will in just a moment. Edit: Out of the box, it doesn't seem to do anything at all without a microSD card with a valid bootloader inserted. Checking if I can set program_usb_boot_mode Edit 2: I set `program_usb_boot_mode=1` in /boot/config.txt, rebooted, and verified `vcgencmd otp_dump | grep 17:` output `17:3020000a`, but the Zero 2 W just sits if I don't have a microSD card inserted. No HDMI output, no attempt to run off USB (tried with two different flash drives). With the microSD card and USB both plugged in, it boots off only microSD and the USB volume shows up as sda.