Schematic diagram for the Xiaomi Redmi Note 8, model code LLDM516, in a 1.66 MB ZIP archive, although the index lists it under firmware. The name identifies it as a circuit diagram rather than a flash image. Phone schematics are used to follow battery and PMIC rails, charging paths, display and camera connectors and signal lines when diagnosing a dead or shorted board. Check that the hardware version of your phone matches before relying on component positions or values.
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 @mischematic. 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 →