Xiaomi Redmi Note 7 Pro archive that, according to its name, covers the sub board, the small daughterboard that usually carries the USB charging port and microphone. It is catalogued as firmware, though the 1.41 MB zip may equally hold diagrams or layout data, so inspect the contents. Material for a sub board helps with charging, USB detection and microphone faults and with checking the flex link back to the main board. Make sure the board marking on the handset matches before working from these files.
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 @phoneSchematics. 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 →