Fourth volume of the BIOS Acer split archive in RAR format, 9.00 MB. It holds a fragment of the data only and cannot be opened independently; the remaining parts are needed to reconstruct the collection. No specific model or board appears in the name. Once extracted, pick the image matching the board number printed on the PCB, read the existing SPI flash with a programmer such as a CH341A first, and ensure the image size equals the chip capacity before writing.
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 @bios_laptop. 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 →