Hard Reset LG LS990 G3

First method:

1. In order to switch off the device hold down the Power key for a short while.
2. After that press Volume Down button and Power button together until the LG logo appears on the screen.
3. When the LG logo is displayed, let go of the Power button, keep pressing theVolume Down key and then press once more the Power button.
4. You should see a factory reset menu on your screen.
5. You should confirm process by choosing appropriate options. Use Volume rockers to navigate and Power button to confirm.
6. Wait to complete the operation.
7. Success! The hard reset has just been completed.

Second method:

1. Turn on the phone by using the Power button. 
2. Afterwards form Main Menu go to Settings.
3. Select General and then Backup & Reset.
4. In the next step select Reset Phone. 
5. Choose Erase Everything if you are sure you want to clear all your data. 
6. Select OK to confirm the whole operation.
7. Well done! You have just performed the hard reset operation.

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