Lenovo firmware for the Realtek RTS5457V USB-C power delivery controller from LCFC board NM-C771, stored as RAR without version or checksum. LCFC is Lenovo's own ODM and marks boards with NM-xxxx codes. A corrupt PD image is a frequent cause of no Type-C charging, and programming this dump into the controller's SPI flash often restores it. Use a hardware programmer, read and keep the existing image first, and verify after writing. Confirm the board number on your PCB before proceeding.
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 .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 →