BIOS firmware for the Lenovo ThinkPad T490, delivered as a 10.2 MB RAR; the name gives no board number, version or source serial. Treat it as a general dump for this model and examine the archive before use. It is written to the SPI flash with a hardware programmer to restore a board that fails to power on or POST because of damaged firmware. Back up the existing chip content first, confirm the motherboard is a T490 and check the image size matches the flash capacity.
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 @biosfilebins. 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 →