BIOS archive for the Sony VAIO PCG-7154M, Sony board MBX-202, with M791 also appearing in the name. Sony identifies its VAIO motherboards with MBX numbers, and the PCG code is the model designation. The RAR is 835 KB, which suggests an older, small-capacity flash chip. Use a programmer to read and save the existing chip, then check that the image size matches before writing. Verify the MBX-202 and M791 markings on the PCB to be sure the firmware suits your unit.
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 (9)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 21 Sept 2021 | Open file on RM Schematics |
| @BiosSchematicWorld | 25 Dec 2021 | Open file on RM Schematics |
| @pepeelectronica | 20 Apr 2022 | Open file on RM Schematics |
| @pepeelectronica | 21 Apr 2022 | Open file on RM Schematics |
| @pepeelectronica | 27 Apr 2022 | Open file on RM Schematics |
| @schematics_bios | 23 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 23 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 26 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 3 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 →