Odroid M2: Start OS on Micro SD won't boot

I flashed the latest Start OS ARM version onto a Micro SD as instructed in Odroid M2 installation documentation. Power it on and nothing shows

Tried it with the switch on Micro SD and on eMMC mode.

When I remove it, it starts to book the onboard images of Ubuntu (proof the device is working correctly)

I was following Claude’s instruction to try boot it from within Ubuntu, and told it:

‘ls /dev/mmcblk1*’ just returns /dev/mmcblk1

It replied:

"That’s the problem! A properly flashed StartOS image should have multiple partitions like:/dev/mmcblk1p1 (boot partition)/dev/mmcblk1p2 (root partition)etc.

Since you only see /dev/mmcblk1 with no partition numbers, the StartOS image wasn’t written properly to the SD card.You need to re-flash the StartOS image. Here’s how:

First, unmount anything that might be mounted:sudo umount /mnt/startos-boot 2>/dev/null

Download the correct StartOS image for Odroid M2 from the official StartOS website"

Has anyone else done this? What image do I use?

Where did you find StartOS installation instructions for the unsupported Odroid M2??

Where does Ubuntu come into this??