This is the . Many Multistar units (especially those running H.264 firmware) have a known vulnerability: they display a unique reset code or serial number on the "Forgot Password" screen. You can plug that code into a third-party "DVR password reset calculator" to generate a master unlock key.

The DVR should now be back to its factory "out-of-the-box" state with no password. 5. Reset via Telnet (Advanced Users)

Here’s exactly what he did—step by step—so you can do the same.

For advanced users. Open the DVR case. Locate the (often labeled J1, TX, RX, GND). Using a USB-to-TTL adapter (3.3V), connect to a PC terminal (Putty, 115200 baud). Power on the DVR. Interrupt the boot sequence by pressing Ctrl+C or Enter within 2 seconds. At the U-Boot prompt, type:

This wipes all passwords and boots into factory default mode.