Hard Reset LG Spirit 4G LTE H440N

First method:

1. In order to switch off the device, hold down the Power key for a short while
2. Afterwards press and hold the Volume Down + Power button for a couple of seconds.
3. When the LG logo appears on the screen release the Power key 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. Firstly, 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. Good job! 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.