Hard Reset LG LS860 Mach

1. Handset has to be switched off. 
2. Press Volume Down + Power button for about 10 seconds. 
3. When LG logo will appear on screen release both buttons.
4. Whole process has to be confirmed to do it press Power button twice. 
5. Device will restart, after that you can work on device.

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