Look at the currently displayed on your DVR monitor.
Most modern EuroNet DVRs have a built-in backdoor for administrators. You will need access to the physical screen or the local monitor connected to the DVR. euronet dvr password reset
This method is for advanced users only. Reflashing the firmware replaces the operating system of the DVR, wiping all settings and potentially corrupting the video database if done incorrectly. Look at the currently displayed on your DVR monitor