Schematic set for the Xiaomi Redmi S2, also sold as the Redmi Y2, codename ysl, packed in a 16.8 MB RAR archive. Although catalogued as firmware, the name describes the contents as a schematic, so expect circuit diagrams and possibly layout files. A technician uses such drawings to trace power rails, charging paths and signal lines on the phone board, and to locate components when diagnosing shorts. Extract the archive, check which file formats are included and which viewer they need, and compare the board revision with the phone.
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 @smart_repair_phone. 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 →