Hard Reset LG Stylus 2

First method:

1. At the very beginning switch off the device by holding the Power key.
2. Then hold down the Volume Down + Power button together..
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. In the next step tap 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! The factory reset hasa just been performed.

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