Hard Reset LG Vu 3

First method:

1. Start by turning off your device. by holding down the Power key for a short while.
2. Afterwards press Volume Down button and Power Button together until the LG logo appears on the screen.
3. Release held keys when the LG logo appears on the screen.
4. Now, you should see factory reset menu.
5. Confirm process by pressing Power button twice. 
6. Now your phone should restart.
7. Success! The hard reset has just been completed.

Second method:

1. If the display is off, press the Power to turn it back on. 
2. Afterwards go to Settings and then to Backup & reset.
3. In the next step tap Reset Phone. 
4. Choose Erase Everything if you are sure you want to clear all your data. 
5. Select OK to confirm the whole operation.
6. Well done! 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.