I just got my new N2 and I tried to install coreelec on an usb pen.
I used etcher to flash the stable version.
When I tried to boot selecting the coreelec image from the system prompt, I got this error:
cannot determine the file type of /usr/var/petitboot/mnt/dev/sda1/kernel.img
I tried to flash the usb pen via Rufus with the same result.