A Hard Reset reverts a phone to its original settings and a clean OS (Operating System) removing all data and information added to the cell phone by the mobile phone user.
In essence a Hard Reset erases everything from the phone and puts the phone back to like new condition as though it’s brand new right out of the box.
1. The first step in hard reseting you phone turning it off by holding down power button.
2. Wait 10 seconds and press and hold power button with volume button combined.
3. After few seconds there should LG logo appear on your screen.
4. A moment later your phone will boot into Recovery mode.
5. Now using your volume keys scroll down to wipe data/factory reset option and press power button to select.
6. And that's it! your phone will restart after it will wipe data.
Doing a factory reset has some advantages for a few purposes.
One of the big ones is wanting to remove all Data from the device.
This is handy if you plan on giving the device to someone else and don't want to give them your contacts or any other information.
In some circumstances it can even be handy to just start over especially if you have some minor issues and you assume the issues are Data related.
If rooted its a great way to wipe the Data and Cache area's to prepare to change the ROM of the device.