Working BIOS for the ASUS X540SA main board, revision 2.1, supplied in a 3.74 MB RAR. Marked as tested, it serves for recovering a laptop that fails to boot or shows a black screen after a corrupted firmware update. Clip or remove the SPI flash, take a full backup of the existing contents, confirm the image size matches the chip capacity, then write and verify with a programmer such as a CH341A. Check that the PCB reads Rev 2.1 before flashing, as other X540 revisions differ.
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.
All sources (4)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 15 Jan 2022 | Open file on RM Schematics |
| @pepeelectronica | 23 Apr 2022 | Open file on RM Schematics |
| @schematics_bios | 24 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 1 Aug 2026 | Open file on RM Schematics |
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 →