...
15. "DC 12V BACKUP POWER" - This is a third backup option. The PCB has three power linespower terminal.
16. "Factory reset" - reset settings to default factory settings. Keep pressing the button for more than 5 seconds. The “Error” LED will start blinking. This indicates that the factory restoration has started. Wait for 20-60 seconds for the system to restart. The “Activity” LED will start blinking once the system has been restarted. The device can be accessed now.
...