Archive labelled as a schematic for the Xiaomi Redmi 5A, 2.85 MB in ZIP format, although it is indexed under BIOS and firmware. The name points to circuit diagrams, so check what is actually inside after extracting before treating it as either documentation or a firmware image. A Redmi 5A schematic would be used to trace power rails from the PMIC, check charging and USB circuits and locate test points when diagnosing shorts. Open the pages in a PDF viewer, and confirm the board markings on your phone match.
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 →