BIOS image for the MSI A55M-P33 desktop motherboard, model code MS-7786, revision 1.0, an AMD A55 chipset board as the model name indicates. MSI prints MS-xxxx numbers and revision on the PCB, so verify both before flashing. The 2.38 MB RAR is used to restore a board that fails to post after a bad update, either through an SPI programmer or by replacing the chip. Read and keep the current chip contents first, and check the image length matches the flash chip, since a mismatched size will not program correctly.
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 | 21 Sept 2020 | Open file on RM Schematics |
| @biositechyangiyer | 5 Oct 2020 | Open file on RM Schematics |
| @biosdumpcomputer | 26 May 2022 | 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 →