LG G4C Unlock Screen Pattern Lock By Reset

Power Off your cell pressing the power key. (Key is on the back side below the camera)
Now Press and hold the Volume Down + Power button together for a couple of seconds.
LG logo Will appers on the screen, release the Power key, keep pressing the Volume Down and then press once more the Power button.
After that you should see the factory reset menu on your screen.
You should confirm process by choosing appropriate options. Use Volume rockers to navigate and Power button to confirm.
Wait to complete the operation.
Yuppie You have Done!