Hard Reset LG K10

First method:

1. The cell phone must be turned off, so hold down the Power key for a short while.
2. In the next step press and hold the Volume Down + Power button together for a couple of seconds.
3. When the LG logo appers on the screen, release the Power key, keep pressing the Volume Down and then press once more the Power button.
4. After that you should see the factory reset menu on your screen.
5. You should confirm process by choosing appropriate options. Use Volume rockers to navigate and Power button to confirm.
6. Wait to complete the operation.
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. In the next step go to Settings.
3. Afterwards select General and then Backup & Reset.
4. Then 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! Your phone is ready to use.

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