Windows executable of DFT Pro, version 4.1.3, a service utility filed here under Xiaomi and roughly 147 MB in size. Tools of this kind are used by phone technicians for flashing firmware, unlocking and repairing software-level faults on supported Android devices, usually through a USB connection in a special boot mode. The file name states no supported model list, so check compatibility with the specific handset before use. Run it only on a dedicated service PC, scan it first, and back up the device data and partitions before writing anything.
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.