Dahua DH-XVR4B08H recorder archive, 158 MB in ZIP form, tagged D1820 and 41_208, apparently the PCB code and board version. Its size suggests a complete flash image, perhaps with additional firmware files. Repair use covers boot loops, logo freeze and corrupted firmware recovery through an external programmer. Make sure your mainboard shows the same codes, dump and store the original memory content before writing, and confirm the image matches the chip capacity.
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 @laptopchiplevelrepair. Enginerys does not host this file.
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Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip