LG E400 User Manual page 579

If you have forgotten PIN or Password: If
you forgot your PIN or Password, you need
to do Hard reset.
Caution: If you perform a hard reset, all user
applications and user data are deleted.
5. Using the hard reset
If it does not restore to the original condition,
use hard reset to initialise your phone.
When the phone is turned off, press and
hold the Home key + Volume down key
+ Power key for over ten seconds. When
the screen shows the LG logo, release the
Power key.
After the screen shows the hard reset
screen, release the other keys.
Leave your phone for at least a minute while
it performs the hard reset, then your phone
will be turned on.
Caution: If you perform a hard reset, all user
applications and user data are deleted. This
cannot be reversed. Remember to back
up any important data before performing a
hard reset.
23