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Hi,
LEDs inform which working mode the device is in and if it has any working problems. Have they been blacked out after a certain event? Has any of them ever blinked at all? It is really strange behaviour I've not seen before. Which firmware are you using? Update to the latest firmware if you are not using that one already, reset the device if you can and let me know if issue persists.
https://wiki.teltonika-networks.com/view/RUTX11_Firmware_Downloads