Hard Reset LG P760 Optimus L9

First method:

1. At the very beginning switch off the phone by using the Power key.
2. Then press and hold together Volume Down + Home + Power button for a few seconds.
3. You may release held keys as soon as the Android Image appears on the screen.
4. That's all. The hard reset operation should be completed.

Second method:

1. If the device is off, hold down the Power button to turn it back on.
2. Afterawrds from Main Menu find and select Settings.
3. Then open the Backup&Reset  folder and select Factory Data Reset.
4. Tap Reset Phone and read the warning when it pops up.
5. Choose Erase Everything and the phone will begin restoring.
6. Well done! The hard reset has just been performed.

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