Here's a step by step instruction on how to properly Hard reset the LG Optimus 3D, If you want to return it to its factory settings again.
This procedures is only advisable if the you'd experience a hang or frozen problem in your device when using or opening any applications installed. 
Please bear in mind that the result of this procedure will delete all data yoy previously installed on your handset.  This process may or may not delete data stored on the microSD card. Just do have a back up copy of all your important data on the device before proceeding.

Factory reset through Menu Settings:

On the main HOME screen, select MENU
   2. Select SETTINGS, then PRIVACY
   4. Select RESET PHONE
   5. When Password is prompted, enter it. Then select ERASE EVERYTHING.

If the problem still persists, or if the phone is frozen, you may then try to hard reset your LG Optimus 3D P920 through button combination.
  1. If your LG Optimus 3D P920 is frozen, turn the Power OFF,  pull out the battery  and reinsert it back again. 
   2. Hold the Home and Volume Down button
   3. Press and hold the Power button until the device turns on
   4. Follow the on-screen instructions on how to reset your LG Optimus 3D P920

Wait 'till the process finish. Once the wipe is complete, the phone will reboot to its factory default state settings. All data you previously installed on it already been deleted.

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