BIOS archive for a Xiaomi (MI) laptop identified as XMA1904-AF, with board number 19800-1, packed as a 6.32 MB RAR. The 19800 pattern follows Wistron board numbering, so Wistron is the likely ODM behind this board. Extract it to find the image, then write it to the SPI flash with a programmer such as a CH341A when the machine shows no boot or a corrupted BIOS. Read and save the original chip contents first and check that 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 @sm_bios. Enginerys does not host this file.
All sources (2)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @sm_bios | 2 Jun 2026 | Open file on RM Schematics |
| @smbiossupport | 2 Jun 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 →