LG Optimus L90 User Manual page 10

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
screen > Select screen lock and select from None, Swipe, 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 Unlock Pattern, PIN, or Password:
If you logged into a Google account on the phone and failed to use the correct
pattern 5 times, tap Forgot pattern? 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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> Settings > Display tab > Lock