Firmware dump for the Sony VAIO SVE111B series on mainboard MBX-272, with V181 in the name, likely a version marker, packed as a 1.89 MB RAR. Sony VAIO boards carry MBX-prefixed numbers, which is the key identifier to match. Technicians program such an image onto the BIOS SPI chip to recover a laptop that will not POST or has corrupted firmware. Make sure the PCB shows MBX-272, keep a backup of the original flash contents, and check that the file size equals the chip capacity.
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 →