Working BIOS for the Lenovo ThinkPad X280, board NM-B521 revision 1.0 dated 2017-06-10, with EX280 as the project name and taken from a unit with an Intel Core i5-8250U. The archive is 8.92 MB. NM-numbered boards follow the LCFC pattern used for Lenovo designs. Use it to reprogram the SPI flash when the laptop fails to boot. ThinkPad chips hold serial and system data, so back up the original first, confirm board number and size match.
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 →