I’ve tried the CM3 with Ubuntu and have no issue with it booting on either the rock3 compute module IO Board or the waveshare CM4-IO-Wireless-Base or the waveshare cm4-eth-rs485-base-B
However when I try Armbian, It doesn’t boot
I’ve been using this image
https://www.armbian.com/rock-3a/
As i think it’s the right one to use