RancherOS Version: (ros os version)
RancherOS 1.5.3 (rancheros-raspberry-pi64.zip)

Where are you running RancherOS? (docker-machine, AWS, GCE, baremetal, etc.)
Raspberry Pi 4 (4GB)

I realise that the Pi 4 is still fairly new, and lots of OSes still need to be updated to support it, but an issue on the main Rancher repository claimed to be running RancherOS on their Raspberry Pi 4, so I thought I was clear to try it out.

But when I flashed the image to the Pi 4 and plugged it in, nothing happened - literally. It was plugged in via Ethernet, but my router didn't detect it as a client. I had it plugged in via HDMI, but my monitor didn't detect any display signal. Absolutely no signs of life.

The same SD card was able to boot RancherOS successfully on a Pi 3 B+ (although the OS was completely broken... but I suppose that's for another issue), and I can even boot other OSes on my Pi 4 just fine.

Only RancherOS is giving me issues, which is bizarre, since someone is claiming to have it running already on a Pi 4.

Does RancherOS already support the Pi 4 and I'm doing something wrong?