Sony laptop firmware package of 621 KB, labelled for a CR series machine with an ATI graphics option and the Sony board code MBX-177A. No revision, chip type or version is given in the name, so open the RAR and inspect the contained image before writing anything. Dumps like this are typically flashed onto the motherboard BIOS chip with an external programmer when the notebook shows no display or loops on power. Match the MBX code printed on the PCB, back up the existing chip contents and verify the image size against 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 →