Hard Reset LG D500 Optimus F6

First method:

1. Start by turning off the phone.
2. Then, press Volume Down + Home + Power Button together until the LG logo appears on the screen.
3. Now, you should see factory reset menu.
4. Confirm process by pressing Power button twice. 
5. Now your phone should restart.
6. Success! The hard reset has just been completed.

Second method:

1. Turn on the phone by using the Power button. 
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.