If the defaults don't work, use these methods to regain access:

If software methods fail, you may need to open the device. Many motherboards feature a "Reset" button or two solder pads labeled "TP" or "JP" that can be shorted with a screwdriver while the device powers on to restore factory settings. CMOS Battery Removal:

A: Try admin / 888888 or admin / 666666 . Look for a sticker near the ethernet port.

Resetting a DVR you don’t own may be illegal. Always obtain permission before performing a factory reset on a device that belongs to a business or another individual.

displayed on your DVR screen to help generate a specific code?

On the login screen, click “Forgot Password” or “Reset Password.” If email was set up, you’ll receive a verification code. Otherwise, you may need to answer security questions.

If the defaults didn't work, don't panic. You have three recovery options, ranging from easy to extreme.