RAR archive of 1.15 MB with BIOS firmware for a Lenovo G550 Intel variant, though the brand is inferred only from the model name. The OKOKOK tag suggests the uploader confirmed it working. No board number or revision is stated, so match the motherboard markings and chipset before flashing. Extract the archive and check whether the contained image fits the SPI chip on the board. Read and archive the existing chip first, then program the dump with a tool such as a CH341A or similar flash 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 .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 →