Firmware archive labelled bl-wmr8300 and marked ok, suggesting a working image. The name does not state a brand or device type, though WMR8300 resembles a router model code. The RAR is 1.64 MB. Confirm the exact device and hardware revision from the unit's label before use. Recovery of such devices is normally done by writing the flash chip with a programmer or through a bootloader. Back up the current flash contents before writing anything.
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 →