Hard Reset LG MS690 Optimus M

1. Make sure, that your phone is off. 
2. Now press and hold Volume Down + Power button + Home button. 
3. Release them, when LG logo appears.
4. Confirm process by pressing twice Power button. 
5. Done, device will now restart and you can work on it.

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