Realtek RTS5457T power delivery firmware from Lenovo LCFC board NM-C921, associated with the 15IMH05 model code given in the name, delivered as a zip. LCFC is Lenovo's own design arm and uses NM-xxxx board numbers. If the laptop shows no USB-C charging or the Type-C port stays dead, flashing this image into the small SPI chip serving the PD controller is the usual repair. No checksum is stated, so compare file size with the chip capacity, read the original first and verify after programming.
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 →