If you want to update your Vivo V3 smartphone to that latest version of Android that is known as Android 7.0 (Nougat) for Vivo V3 smartphone, then you will need to root your device in order to flash the custom ROM on your Vivo V3 that will be an alternative to official Android 7.0 (Nougat).
Updates
How To Update Vivo X21 To Android 10 Official OTA Update
Well, if you are a user of this awesome smartphone that was officially released in 2018 named Vivo X21, then you are in the right place here. As you will get to know the latest news about your Vivo X21 smartphone. The news is all about the latest update Aka Android 10.