Hard Reset LG Optimus LTE SU640 LU6200
- Handset has to be switched off. 
- Press Volume Down + Power button for about 10 seconds. 
- When LG logo will appear on screen release both buttons.
- Whole process has to be confirmed to do it press Power button twice. 
- Device will restart, after that you can work on device.
          WARNING !
Hard Reset will erase all of your data
Hard Reset will erase all of your data

 
its not working on my phone
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