I tried the following from an Onion article related to the leds but nothing worked:

(for example the mod-ledtrig-morse couldn't be installed)

opkg update && opkg install mod-ledtrig-morse

echo morse > /sys/class/leds/onion:amber:system/trigger

cat /sys/class/leds/onion:amber:system/trigger

echo Hello, Onion > /sys/class/leds/onion:amber:system/message

root@Omega-12D9:~# cat /sys/devices/platform/leds-gpio/leds/onion:amber:system/delay 50
echo 100 > /sys/devices/platform/leds-gpio/leds/onion:amber:system/delay

echo default-on > /sys/class/leds/onion:amber:system/trigger

gpioctl dirout 1
echo 100 > /sys/devices/platform/leds-gpio/leds/onion:amber:system/delayecho 100 > /sys/devices/platform/leds-gpio/leds/onion:amber:system/delay