Download the ( .tgz file) for your specific Poco X3 Pro region. Extract the Fastboot ROM to your desktop. Download the Patched Firehose File ( prog_firehose_ddr.elf ).
: In flashing tools like MiFlash , manually select the patched prog_firehose_ddr.elf file in the "Select Programmer" field .
However, it is a double-edged sword. Without respect for the process, it can destroy your device’s boot chain. By following this guide—using the correct patched file ( vayu ), the right version of QFIL, and a stable cable—you can recover from almost any software brick.