Odroid-c2 not booting ?

Hi !

I just bought an odroid-c2. Flashed the librelec odroid-c2 image with balena etcher. Then plugged it in the odroid-c2. Plugged in an hdmi cable, and a micro usb cable. A red led turns on but nothing happens. I left it like this for about an hour (as I saw it might so some sd card formatting), but the screen doesn't even detect an input and stays idle.

The sd card works (with proper OSes) on a rbpi, and the screen/cable works with a laptop.

No emmc card is attached. The SDcard is a sandisk ultra 32GB

Did anyone have this issue before ?