How to factory reset VIVO Y91? How to wipe all data in VIVO Y91? How to bypass screen lock in VIVO Y91? How to restore defaults in VIVO Y91?
The following tutorial shows all method of master reset VIVO Y91. Check out how to accomplish hard reset by hardware keys and Android 8.1 Oreo settings. As a result your VIVO Y91 will be as new and your Qualcomm Snapdragon 439 core will run faster.