Firmware dump labelled DHI-LM22-L200, compressed as a RAR archive of roughly 789 KB. The prefix suggests a Dahua-type device code, but the name gives no further details on hardware revision or chip type, so identify the flash memory on the board before use. Such a dump is normally written to the SPI or EEPROM chip with a programmer to restore a unit with corrupted firmware. Always read and archive the original contents first and confirm the image size matches the chip capacity before you write it.
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 @biosarchive. 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.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →