Firmware dump labelled for a device identified only as Broadkam WJ820, with the name indicating a 2MB image, packed in a RAR archive of 1.47 MB. No board number or revision is given, so the exact target hardware should be confirmed from markings on the PCB before use. A 2MB dump corresponds to a 16Mbit SPI flash chip; check the chip capacity matches, read and save the original contents with a programmer such as a CH341A first, then write and verify the image after extracting it from the archive.
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 →