Toshiba Satellite U500-12C BIOS package, labelled A1 Intel MV UMA at revision 2.2, in an 852 KB ZIP. The UMA marking means the integrated-graphics board variant. It complements the discrete DSC dumps for the same model family, and the two should not be mixed. Flash it to the SPI chip with a hardware programmer when the board fails to post because of bad firmware. Read and archive the existing chip first, and check the revision and that the image size fits the flash chip.
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 →