Applies to: DN81Q/DN41Q
1. try to restore DVR to factory default like the picture below.
2. You can buy another time battery because maybe the battery is dead.
You need to open the DVR to replace the battery.
The picture below shows where the battery is located.
Time on monitor keeps showing the wrong time after several hours you correct it.
Go to the Main Menu--System--Net service to set up NTP.
Reboot system after you finish all.