Hard Reset LG VK815 G Pad X 8.3

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. You should releaee all buttons when the Factory Mode appears on the screen.
5. Then press the Power key to continue the hard reset process or either of theVolume buttons to cancel.
6. Afterwards use the Power key once more to confirm or one of the of the Volume buttons to quit.
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 Factory Data Reset and 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.