Engineering ROM for the Xiaomi Redmi 13, codename tides, in a large 1.34 GB RAR archive. Engineering firmware is a factory or service build, often used to unbrick a device, test hardware or reach low-level partitions that retail software hides. Flashing generally requires the proper vendor flash tool and drivers in a download mode, and may need an authorised account. Back up user data and device-specific partitions such as calibration data first, and confirm the codename matches the phone before flashing.
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 @mrepairo. 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 →