Okay the amrmbian buster version above works
https://www.armbian.com/nanopi-fire3/

I have exactly same issue, on boot the HDMI throws up FriendlyArm logo onto the HDMI screen and then just sits there and the green LED stops flashing. If I install and LCD screen it throws up the same logo image and then continues on and boots properly. So it's clearly an issue as a number of us hav...