Circuit diagram archive for the Xiaomi Redmi 4A, code name rolex, packed in a 2.47 MB ZIP file even though the catalogue lists it under firmware. The name points to schematic content rather than a flashable image. Repair technicians open such diagrams in a PDF viewer to follow battery and charging paths, check PMIC outputs, locate connectors for the screen and USB port, and narrow down which component is shorting a rail. Confirm the board marking on your unit before trusting any pinout or part value shown.
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 @esquematicosparatodos. 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 →