Working BIOS for the Lenovo ThinkPad T490 on board NM-B501, the Type-C variant as noted in the name. NM-xxxx numbering belongs to LCFC, the Lenovo-owned ODM. The small 772 KB archive suggests a partial or EC/Type-C related image rather than a full SPI dump, so inspect the contents before writing. Program it with an SPI programmer only after backing up the original chip, confirm the board number on the PCB, and check the image size matches the target 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 .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 →