Acer firmware archive labelled for the Aspire 5742 laptop, 1.70 MB in RAR form, with no board number, revision or version stated in the name. It is typically used to reprogram the BIOS SPI chip on a unit that powers on without display or is stuck after a failed update. Extract it and check whether the image size equals the flash capacity, since a mismatched file will not fit. Note the board number printed on the PCB, as one model can ship with different boards, and back up the original chip 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 @biosbigarchives. 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 →