Vivo Y91 pattern lock unlock password pin unlock flash done by umt dongle. You can unlock and flash by umt mtk tool. Before unlock connect your device power on state, then select start your Umt dongle mtk tool select Brand and model by the video process. When the tool run switch off your device if not connect disconnect again connect by press Vol + button.
Vivo and Oppo all new security patch type is some harder to remove locks. You must identity by the cpu type and Start the process. How to find the Model name during locked your device or forgot password stage. Vivo users open the camera and take the picture select the picture open information icon to view Vivo model number , Oppo users go to emergency tab type *#899# you view the software information.
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