Hard Reset LG P500 Optimus One

1. Power button to switch off device. 
2. Then press and hold Volume Down + Power button + Home button. 
3. Release them, when LG logo appears.
4. Confirm process by pressing Power button. 
5. Now your phone will restart.
6. Done, you can work on your device.

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