Hard Reset LG G4 H818P

First method:

1. In order to turn off the phone, hold down the Power key for a short while.
2. After that, press and hold 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. After a while you should see the factory reset menu on your screen.
5. Confirm process by choosing appropriate options using Volume rockers to navigate and Power button to confirm.
6. Now your phone should restart.
7. Well done! The hard reset has just been completed.

Second method:

1. If the display is off hold down the Power button to turn it back on.
2. Afterwards go to Settings.
3. Select General and then Backup & reset.
4. In the next step tap Reset Phone. 
5. Choose Erase Everything if you are sure you want to clear all your data. 
6. Then select OK to confirm the whole operation.
7. Success! Your phone is ready to use.

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WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.