Hard Reset LG L90 Dual D410

First method:

At the beginning switch off your phone by holding the Power key for a short while..
The hold down the Volume Down and Power button together until the LG Logo appears on the screen.
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.
Afterwards you should see a factory reset menu on your screen.
Confirm process by choosing appropriate options using Volume rockers to navigate and Power button to confirm.
Now your phone should restart.
Success! The hard reset has just been completed.