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I am not responsible from any brick or damage to your device. Make a Back-Up First. It will delete ALL of your data (music, video, photo etc.)
1-Download LG Flash Tool 2014
http://www.mediafire.com/download/fwrcd3pdj0svjtb/LG_Flash_Tool_2014.zip
2-Download LG United Driver
http://tool.xcdn.gdms.lge.com/dn/downloader.dev?fileKey=UW00120120425
3-Download LG Mobile Support Tool
http://tool.xcdn.gdms.lge.com/client/app/B2CAppSetup.exe
4-Download KDZ File
http://pkg02.xcdn.gdms.lge.com/dn/downloader.dev?fileKey=FW26K91032AMA1JBC1F42ZP/V50030a_00.kdz
+ WARNING : Remember copy KDZ file into LG Flash Tool 2014 folder
+ If you cannot run LGFlashTool2014.exe, please install Visual C++ Runtime Library: https://googledrive.com/host/0B9l4QOCXUmxXV19jN1ZrTnBwdTQ/VC_RedistInstaller.exe
5-Turn off your device. Push Volume Up and Down buttons at the same time. Plug your device into your computer. It will enter Download Mode
Open LG Flash Tool 2014 and set like this, choose KDZ file> Click on Normal Flash> In the pop-up click on Start> In the next pop-up choose your preferred Language> Click OK> Procedure will began wait until it finishes.
NOTE: If your device stuck in LG Logo Screen (Bootloop) HARD RESET
Turn off your device completely (Hold on to power button 10 sec)
1-Push power and Volume Down (First power, second Volume Down and do it quick)
2-When LG logo appears leave power button, hold Volume Up without releasing Volume Down Button and Hold Power Button at the same time. (Make it quick)
3-Proceed the Hard Reset
Don't forget to Back-Up FIRST
There is NO working Root method at the moment[
If you want to go back to JellyBean or Kitkat by using Flash Tool select CDMA mode. Thanks to @Die Bruine
Credits; Thanks to @quangnhut123 for LG Flash Tool 2014
Thanks to @sugaritos for letting us know about KDZ
Thanks to @ckret 'If you Select Type CDMA and select CSE Flash you don't have to perform HardReset'
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