Firmware package for a DVR or NVR recorder identified as AHM8008T-NB, built on board N68C, version V1.01B, packed in a 14.5 MB RAR. The name does not state the brand, so check the label on your unit and the main board marking against N68C. Such images are used to recover recorders stuck on the logo or in a reboot loop via USB, TFTP or an SPI programmer. Save the original flash dump first, because a mismatched build can leave the unit unbootable.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @vinafix_bios. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)