The (e.g., 00031095 ) are your unique hardware identifier.

Once you have downloaded the correct .bin or .upgrade file, follow these steps to install it: V4.02.R11 H.264 H.265 DVR NVR Firmware Download

If your device is corrupted and won't boot, you may need to open the case and look for a directly on the motherboard. Download Resources for V4.02.R11

: Ensures support for newer 5MP, 4MP, and 1080P AHD or IP cameras.

: Specifically hosts firmware for HiSilicon chipsets (Hi3520, Hi3521, Hi3535, etc.) used in generic recorders.