@OttawaHacker connect to the board using a usb-uart (debug) serial dongle. the boot messages would normally show up there, or that if it booted to the prompt, you could login as root and run dmesg to see what goes wrong   try also the other u-boot https://github.com/ag88/1.5GB_Fix_for_Armbian_on_OrangePiZero3/ to see if that helps. there is a sequence of patches that needs to be applied and I've done that with my implementation. Unfortunately, in my case I