Hard Reset LG LS980 G2

First method:

1. At the beginning power off your cell phone.
2. Afterwards, press and hold the Volume Down + Power button together for a few seconds.
3. When the LG logo is displayed, let go of the Power key, keep pressing the Volume Down key and then press once more the Power button.
4. Now, you should see factory reset menu.
5. Choose appropriate options by using the Volume buttons to scroll and Power keyto select.. 
6. Now your phone should restart.
7. Success! The hard reset has just been completed.

Second method:

1. Turn on the phone by using the Power button. 
2. Afterwards go to Settings.
3. Select General Tab and then Backup & Reset.
4. In the next step Factory Data Reset and  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!

Third method:

1. First of all, hold down the Power button to switch off the mobile phone.
2. After that, press and hold Volume Down + Power key for a couple of seconds.
3. You can release held keys when the Recovery mode text appears on the screen.
4. Press Volume Down to choose "wipe data/factory reset", and then push thePower button to confirm.
5. Select "Yes--delete all user data". Use Volume Down button to scroll and Power button to select.
6. To restart the phone, select "reboot system now".
7. Success! The hard reset is done!

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