For the Poco X3 Pro, the patched Firehose is the holy grail of unbricking. It allows you to:

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A Firehose file ( .elf or .mbn ) acts as a bridge between Qualcomm’s Sahara protocol and your PC’s flashing tool (like QFIL or MiFlash). It tells the processor how to accept raw data.

In Qualcomm devices, is a protocol used for low-level flashing. It allows the computer to send raw data to the phone’s storage (eMMC or UFS). The prog_emmc_firehose_*.mbn file is essentially the "driver" or "key" that tells the storage controller how to accept new data.

Too late. See you in the next EDL mode.