I have very old D-link DNS-120 NAS, with installed OpenWrt Backfire 10.03.1.
System works fine, but LED indicators (network connection and USB) does not working.
LED menu in LuCI is empty. All required packages is installed. Is it possible to enable LED indicators on this device on OpenWrt Backfire 10.03.1?
I am not really sure if this would be the solution to your problem but in any router most of the LEDs are linked to GPIOs and this is how Openwrt controls the LEDs and identify them. I myself started using Openwrt from v15.05 so I dont have much information about Backfire. It maybe helpful for you to try to read the documentation at openwrt.org for Backfire or considering updating your router to a more current release, maybe 15.05 or 17.01. If possible v18.06 would be a better answer.
I think any of the moderators might be able to help you on this. Maybe @tmomas.