Zipped dump of Realtek RTS5457 PD controller firmware for Lenovo board NM-B531, built by LCFC, Lenovo's in-house ODM that uses NM-xxxx numbering. The name lists no version or checksum. Technicians write this image to the small SPI flash serving the Type-C controller when a laptop will not charge over USB-C or the port shows no activity. Check that the board code on the PCB matches, read and archive the original chip contents, then program and verify with a suitable SPI programmer.
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 @biosdumpcomputer. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →