Hard Reset LG D856 G3 Dual-LTE

First method:

1. At the beginning switch off your cell phone by holding the Power key for a short while.
2. In the next step hold down the Volume Down and Power button together until the LG logoappears on the screen.
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 that you should see a factory reset menu on your screen.
5. You should confirm process by choosing appropriate options. Use Volume rockers to navigate and Power button to confirm.
6. Wait to complete the operation.
7. Success! The hard reset has just been completed.

Second method:

1. Turn on the phone by using the Power button. 
2. Afterwards from Main Menu go to Settings.
3. Select General and then Backup & Reset.
4. In the next step tap Factory Data Reste and 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! You have just performed the hard reset operation.

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