Hard reset LG G2/ G3/ G4/ Lg G2 mini /G3 mini /G4 mini /G stylo lg flex
1-The device must by turned off,
2-Then hold down the Volume Down and Power button together for a couple of seconds.
3-When the LG logo is displayed, let go of the Power key, keep pressing the Volume Down and then press once more the Power button.
4-Afterwards you should see a factory reset menu on your screen.
5-Confirm process by choosing appropriate options using Volume down to navigate and Power button to confirm.
7-Now your phone should restart.