On the on-screen virtual keyboard (when using a mouse), the DVR may default to capital letters. Ensure you are typing admin in lower case. On the physical USB keyboard, check that Num Lock is off if the password contains only numbers.
Example: If your device model is “Multistar XVR-5000,” search “XVR-5000 default password” and check the included manual before changing network exposure. multistar dvr default password work