2. How to retrieve the password of the NVR mobile terminal when you forget it/how to reset the administrator of the NVR mobile terminal ?

Open the Control Panel→Click Restore Default→Select APP User→Click OK

At this time, all mobile phone users who have added NVR will be cleared, and the password will be restored to 888888, 

and then the first user who adds NVR will become the new administrator of NVR mobile terminal.