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, Knock Code, Pattern,
PIN or Password.
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.
Warning! If you perform a Hard Reset, all user applications and user data will be
deleted. Please remember to back up any important data before performing a
Hard Reset.
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> Settings > Display tab > Lock