Still remember the lock screen password:
You can enter the Settings>Face, fingerprint and password/Fingerprint and password/Security, and turn off the lock screen password (some models also need to turn off the Privacy and application encryption password),then you can reset the lock screen password and reset the security question .
If you forget the lock screen password and cannot unlock the phone:
1.Via the Google “Find My Device” function to erase the phone data, it will also clear the lockscreen password:
a. Go to https://www.google.com/android/find and sign in to your Google Account.
b. If you have more than one device, click the lost device at the top of the screen.
c.Get the device info;
d.Select ERASE DEVICE function, can factory the phone, here are some requirements needs to be satisfied:
1). Your phone is powered on;
2). Your Google account is logged in;
3). Your phone is connected to the Internet；
4). Find My Device is activated
2.Bring your mobile phone and purchase voucher to the vivo customer service center for further assistance.
