Working BIOS dump for a Wistron board labelled LSN-4 UMA, with motherboard number 11263-2, meaning the integrated-graphics version without a discrete GPU. No laptop brand or model is given in the name, so match it by the board number printed on the PCB. Wistron uses these five-digit MB numbers with a dash suffix for revision. Read and back up the existing SPI chip with a programmer before writing, and make sure the image size equals the flash capacity, since a mismatched file will not fit.
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 .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →