ZIP archive of BIOS firmware for the Lenovo G505 and G405, 1.81 MB in size, with no board number, revision or graphics variant stated in the name. Extract it to see which images are included and check their sizes against the flash chip on your board. The G505 and G405 share related Compal-designed boards, but UMA and discrete versions differ, so compare the board number printed on the PCB. Back up the original chip before programming with an external SPI programmer.
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 →