ASUS X421JA BIOS archive for mainboard revision 2.0, described in the name as fully working. The name gives no CPU, GPU or flash-size details, so open the RAR and check the image size against the SPI chip before use. A dump like this is used to recover a laptop that powers on without display or fails to boot after a failed update. Flash it with a programmer such as a CH341A or RT809. Back up the original chip first, and verify that the board says X421JA REV 2.0 on the PCB silkscreen.
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 (3)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 6 Nov 2023 | Open file on RM Schematics |
| @generalbios | 3 Dec 2023 | Open file on RM Schematics |
| @generalbios | 4 Nov 2024 | 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 →