Hard Reset LG D505 Optimus F6

First method:

1. In order to switch off your phone press and hold the Power button.
2. Afterwards press and hold Volume Down + Power Button together for a couple of seconds.
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. 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.