Full schematic for the Xiaomi Redmi 9, code name lancelot, covering the main board marked J19, revision V4, packed in a 2.00 MB RAR archive despite being listed as firmware. The diagram set lets a technician trace power rails from the PMIC, follow charging, display and baseband signals, and locate components when hunting shorts or no-power faults. Extract with WinRAR or 7-Zip and open the PDF inside; confirm the board marking and revision on the phone match before relying on part 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 .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →