First post here! I hope to be part of this community, I think I'll need it because there are lots of things to solve. Let's si if once every piece of docs is released the board improves.
You'll get an output with something among .That is the mode of your LED, it should be default-on but it will probably be timer. Write this:
echo default-on > /sys/class/leds/onion:amber:system/trigger