Enter this link followed by your imei at the end of the link with no spaces.(youll find it on your phones box)
The link will look like an error message, but will include another link to your most current firmware kdz format, enter it, it will start the download.
Put the phone in download mode.
Take the kdz file put it in LG Flash tool 2014 and follow the on screen instructions. It should take 5 min.