LG Optimus G Pro E986 hard reset

If you perform a hard reset, all user applications and user data will be deleted.
Please remember to back up any important data before performing a hard reset. LG Optimus G Pro forgotten password
Using the Hard Reset (LG E986 Factory Reset)
If your phone does not restore to its original condition, use a Hard Reset (Factory Reset)
to initialize it.
1 Turn the power off.
2 Press and hold the Power/Lock key + Volume Down key.
3 LG Logo appears on the screen and After a few seconds, FACTORY HARD RESET
screen will appear, Now release all keys.
4 The phone will allow you to select the factory reset function in the Android system
recovery utility by pressing Power/Lock key.
5 Press the Power/Lock key again to confirm factory reset and your phone will be
restored to its factory settings. To cancel, press any other key.
lg optimus g pro e986 hard reset

or Reset LG Optimus G Pro from Menu - Reset LG E986

To reset your LG Optimus G pro E986 hard reset phone to factory settings and erase all the data on your phone, Select Settings → Back up and reset→ Factory data reset → Reset device→ Delete all.
On Android ICS or Jelly Bean 4.0 4.1 or higher

Resetting the phone does not erase any system software updates you have downloaded or any files on your microSD card,
such as music or photos. If you reset the phone in this way, you are prompted to re-enter the same information that you did when you first started Android.
If your phone does not restore to its original condition, use a hard reset (factory reset) to initialize it

General advice: Before you buy a new cell phone or new tablet, please try the following procedure to repair your device in a software way. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before doing factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well. All information is for devices with stock based ROMs. If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.! Please also note, that a hard reset operation will not unlock your mobile phone's SIM lock or network lock, but it will remove the unlock pattern, remove the user password or PIN password (NOT the SIM card's 4 digit PIN code). Also note that the firmware version will not be affected in any way, it will not be downgraded, it will remain the same you are using and if you have rooted your device, root privileges remain also unaffected.