Factory Reset Vivo Y51A from Settings Open Settings on your phone. Scroll down and tap on Backup & Reset. Look for the Factory data reset option and tap on it. Now, tap on the RESET PHONE button and enter your Passcode or PIN. Now, select ERASE EVERYTHING to erase all your data, apps, and settings. Randomly reboots or restarts, Shuts down without restarting, Start your Vivo Y51a in bootloader mode unlock your bootloader and help your phone running better. Bootloader Mode is separate from the operating system and offers many useful options such as install Stock ROM, install Custom ROM, TWRP etc. How to hard reset on your vivo Y51a ? If you need to wipe your phone's data for any reason, you can perform a hard reset in recovery mode. This feature will completely erase your personal information and data from your device and make it 100% clean. Kd8OCE.