LG-E400 pattern lock done by hard reset Solution 100% Ok

turn off the phone,,press and hold the home key + Volume down key +Power key 
for over 10 seconds.when the screen shows the lg logo,release the power key,



after the screen shows the hard reset screen,release the other key.

leave your phone for at lease a minute while it performs the hard reset, 
then your 
phone will turn on,,,,and you're,,,,,,,DONE,