Hard Reset LG D852 G3

First method:

1. Start by turning off your device.
2. Press Volume Down button and Power Button together until the LG logo appears on the screen.
3. When the LG logo is displayed, let go of the Power Button, keep pressing theVolume Down key and then press once more the Power Button.
4. You should see a 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. Success! The hard reset has just been completed.

Second method:

1. Turn on the phone by using the Power button. 
2. Afterwards go to Settings.
3. Select General and then Backup & reset.
4. Tap Reset Phone. 
5. Choose Erase Everything if you are sure you want to clear all your data. 
6. Select OK to confirm the whole operation.
7. Well done!

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