Hard Reset LG Leon 4G LTE H340N

First method:

1. At the very beginning switch off the cell phone by pressing the Power button. 
2. in the next step press the Volume Down + Power button for a couple of seconds.
3. When the LG logo will appear on screen release Power button for a short while and press it again.
4. You should release all keys whe the factory reset menu appears on the screen.
5. Afterwards select option "Yes" by using Volume Down to navigate and Power button to accept. 
6. Well done! The hard reset has just been performed.

Second method:

1. Turn on the phone by using the Power button. 
2. Go to Settings and then to Backup & Reset.
3. Tap Factory data reset. 
4. Choose Reset phone and select Erase everything.
5. 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.