Archive whose name says it contains a schematic for the Xiaomi Redmi 4X, though it is filed as firmware. The 5.29 MB RAR package should be opened to check whether it holds PDF circuit diagrams, layout files or flash data. A schematic for this phone lets you follow power rails, the charging circuit and display lines and locate components on a faulty board. Confirm the model on the device matches before use.
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 →