Firmware dump for Lenovo ThinkPad E480 and E580 laptops built on LCFC board NM-B421 revision 1.0, packed in a 4.66 MB RAR archive. NM-xxxx is the numbering used by LCFC, the Lenovo-owned ODM, and the name gives no further detail about ME state or chip type. Repair shops use such an image to reprogram the BIOS chip with an SPI programmer when the machine shows no display or loops on power-up. Save the original contents before erasing anything and confirm the board revision silkscreened on the PCB.
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 (7)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 31 Aug 2020 | Open file on RM Schematics |
| @biositechyangiyer | 10 Sept 2020 | Open file on RM Schematics |
| @BiosSchematicWorld | 4 Feb 2022 | Open file on RM Schematics |
| @pepeelectronica | 24 Apr 2022 | Open file on RM Schematics |
| @biosdumpcomputer | 26 May 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 →