Realtek RTS5455 series Type-C power delivery firmware for the Lenovo NM-B421 motherboard, an LCFC (Lenovo-owned ODM) board number. The name does not give a board revision, so compare it with the label printed on the PCB. Technicians write the image to the controller's SPI flash with a programmer when the laptop will not charge over USB-C or a port is dead. Read the original chip first and keep the backup. Make sure the extracted image size fits the target flash before writing.
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 | 18 Sept 2025 | Open file on RM Schematics |
| @smbiossupport | 18 Sept 2025 | 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 →