Lenovo firmware archive in RAR format tied to machine type 90G9, with the name also carrying the token FT4STMS and board revision 1.2. The 90G9 code points to a Lenovo desktop machine type, and the revision figure should be compared with the silkscreen on the motherboard before flashing. Technicians typically extract the binary and write it to the SPI BIOS chip with an external programmer to recover a dead or corrupted board. Always dump and keep the original firmware first, and verify that the file size equals the flash chip 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 @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 | 10 Jan 2022 | Open file on RM Schematics |
| @pepeelectronica | 24 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 →