Hard Reset LG L90 Dual D410

First method:

1. At the beginning switch off your cell phone by holding the Power key for a short while..
2. The hold down the Volume Down and Power button together until the LG Logoappears on the screen.
3. When the LG logo is displayed, let go of the Power key, keep pressing the Volume Down and then press once more the Power button.
4. Afterwards you should see a factory reset menu on your screen.
5. Confirm process by choosing appropriate options using Volume rockers to navigate and Power button to confirm.
6. Now your phone should restart.
7. Success! The hard reset has just been completed.

Second method:

1. If the display is off hold down the Power button to turn it back on.
2. Afterwards go to Settings.
3. Select General and then Backup & reset.
4. Tap 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!

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