BIOS dump for the Lenovo B490 laptop, marked LB49A and Wistron motherboard 12208-1, with the name stating an 8 MB flash image. Wistron is the ODM behind this numbering pattern. The 5.38 MB RAR holds the file a technician writes to the SPI chip when the machine does not post or the firmware is corrupted. Make sure the board number on the PCB matches, confirm your chip is 8 MB so the image fits, and read the original contents for backup before erasing.
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 →