Performing low-level operations (like writing XML firmware or EMMC dumps) carries a high risk of permanently damaging (bricking) the device if not done correctly .
Around 2019–2020, Oppo and Xiaomi devices started implementing a mechanism. If a technician tried to flash the wrong firmware or downgrade the software, the phone would hard-brick (die completely). Traditional tools couldn't fix it. Oppo Qualcomm Tool V1-3 Gsm Sulteng