If the default credentials do not work, you will need to recover or reset the password. The method depends on the specific interface of your DVR.

For professional-grade brands like Hikvision and Dahua, the manufacturer provides dedicated software tools.

If you are setting up a new or reset DVR, or if you never changed the original settings, you can often log in using factory defaults. Leave the password field completely blank if no password is listed. Common Generic / Unbranded H.264 DVRs admin | Password: (Blank / No Password) Username: admin | Password: 123456 Username: admin | Password: 1234 Username: admin | Password: 000000 Username: admin | Password: admin Major Brand Defaults

The system time should now display a baseline factory date (such as 2000-01-01 ). Refer back to the in Section 3 to log in using the matching baseline backdoor code. 6. Crucial Post-Recovery Security Steps

Remove the silver coin-shaped battery (CR2032) for 2–5 minutes. This sometimes clears the internal clock and reverts the password to default.

Enter the resulting 6-digit or 8-digit code into the password field on the DVR. Common Date-Based Backdoors

Upon rebooting, the admin account will revert to having no password. 5. Physical Hardware Reset Methods

Older generic H.264 firmware versions leave Telnet port 23 open by default. This allows command-line network access to the underlying Linux operating system file directory.

When you set up remote viewing via P2P (QR code), DDNS, or port forwarding, the same admin password is used for:

Keep the pins bridged while you plug in the power cable and turn on the DVR.

Locate the silver button-cell CR2032 battery clipped to the motherboard.

Enter the DVR's current date into the generator software.