LG P935 Guide De L'utilisateur page 29

Important Notice
NOTE
In case that you would have trouble
with Face Unlock, you can unlock the
screen with the unlock 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 with keying in the
backup PIN.
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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. Or, you can unlock the phone with
the Backup pin.
Caution
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.
1 Turn the power off.
2 Press and hold the following keys at the
same time for 8 seconds: Down Volume Key
+ Power/Lock Key
3 Release the keys when the FACTORY HARD
RESET screen appears.
4 Read the warning and press the Power/Lock
Key to confirm. Press any other key
to cancel.
5 Press the Power/Lock Key
once more or press any other key to cancel.
6 Your device will perform a hard reset.
to confirm