Important notice
4. Using a screen lock
Set a screen lock to secure your phone from unauthorized use. To set the screen lock, follow the process below.
From the Home screen, tap Apps 
> Settings 
> Display tab > Lock screen
>Select screen lock and select from None, Swipe, Knock Code, Face Unlock, Pattern, PIN or Password.
NOTE: In case that you have trouble with Face Unlock, you can unlock the screen with a pattern and/or PIN as a backup.
Warning! Take precautions when using an Unlock Pattern, PIN, or Password. It is very important that you remember the screen unlock information you set. You are allowed 5 attempts to enter your screen unlock information. If you used up all 5 opportunities, you will have to wait 30 seconds to attempt unlocking the phone again.
When you can’t recall your screen lock:
If you logged into a Google account on the phone and failed to use the correct screen lock 5 times, tap the Forgot button. You will be required to sign in with your Google account and prompted to create a new unlock pattern.
If you have set a backup PIN, you can unlock the screen by entering the backup PIN. If you haven’t created a Google account on the phone or you forgot your PIN or Password, you need to perform a hard reset.
5. Using Hard Reset (Factory Reset)
If your phone needs to be restored to its original condition, use a Hard Reset to initialize your phone.
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