Hard Reset LG F70 D315

First method:

1. In order to switch off the device hold the Power button for a short while.
2. Then hold down together two buttons Volume Down and Power button for a couple of seconds..
3. Release for a moment Power key when the LG logo appears on the screen and press it again.
4. Now, you should see factory reset menu.
5. Confirm process by 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. At the beginning press the Power button to turn the cell phone on. 
2. Afterwards go to Settings and then to Backup & reset.
3. 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!

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