BIOS image for a ZX-H61C board with B75 noted in the name, version V2.31, marked as working. The name does not identify the vendor beyond these tokens, so match the board model printed on the PCB carefully. Such a file is used to recover a desktop board with corrupted firmware by writing the SPI chip through a programmer. Before flashing, save a dump of the existing chip, confirm the extracted image size equals the chip capacity, and verify after programming.
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 →