Always verify that the Firehose programmer ( .bin or .mbn file) is either from the device’s stock firmware package or from a trusted developer source.
Fixing corrupted bootloader partitions that prevent normal startup. How to Use the Qualcomm Flash Loader Interface Qualcomm Flash Loader V1.0
(Note: --legacy flag forces V1.0 protocol, else Firehose.) Always verify that the Firehose programmer (
Recovering a "hard-bricked" device that does not turn on or is stuck in a boot loop. Qualcomm Flash Loader V1.0