In order to hard reset a LG G3000, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
LG G3000 device will be brought back to the default configuration of a brand new device.
1. Press'n'hold the Power button until the phone turns off.
2. Press the Call button to summon the dialer.
3. Enter this code into the dialer - 1809#*101# or 2945#*101#
4. Press the Call button once more. Voila! The phone will now reset & restart.