Clownfish

I burned a xz compressed image of Armbian Focal onto a good SD card using BalenaEtcher as instructed on the Armbian website.
I placed it into my NanoPC T4 - which currently boots from the eMMC, and held the boot button while powering on. 
It tried to boot - but it kept reporting there was no bootloader file and seemed to be trying to load something from the internet, not the SD card.
 
If I dont press the boot button, it simply ignores the SD card and boots from eMMC.
 
I reburned the SD card several times, and each time it verified fine.  
 
Does anyone know what I did wrong?

Should be able via code { font-family: Consolas,"courier new"; color: crimson; background-color: rgba(0, 0, 0, 0.2); padding: 2px; font-size: 105%; } armbian-config