When the bootloader is locked or corrupted, standard Fastboot commands will not work. EDL mode coupled with a patched Firehose is the only software-based salvation left. Prerequisites Before Flashing

bkerler/edl: Inofficial Qualcomm Firehose / Sahara ... - GitHub 7 Aug 2021 —

ERROR: function: sahara_rx_data: 284 Unable to download flash programmer

Before starting the unbricking process, ensure you have the following:

Finding a reliable, patched Firehose file for the Poco X3 Pro is notoriously difficult. The device has two codenames: (global variant) and Bhima (Indian variant), both powered by the Snapdragon 860 (SM7250) chipset.