Connect your device to a computer and transfer update.zip straight to the of your phone's internal storage (do not place it inside any folder). Power off your smartphone completely.
If your phone is completely unresponsive (black screen, EDL mode), you need the raw firmware files flashable via Qualcomm Flash Image Loader (QFIL) or Mi Flash Tool. RAR/ZIP (Contains rawprogram0.xml) Download Mirror: Qualcomm Official Firmware Archive How to Install Stock ROM on LeEco Le Pro 3 Elite X722 official letv leeco le pro 3 elite x722 stock rom link
Depending on the device state, there are two primary ways to return to stock: Local Update (Standard): Rename the downloaded official ROM to update.zip Connect your device to a computer and transfer update