I had to flash kdz today and here is what you have to do to make it work:

- download kdz from the link above (the one with imei)
- go to flashing guide for g2 from first post
- download LG Flash Tool 2014 from kdz flashing guide
- download universal drivers from tot flashing guide
- install drivers
- connect your device in download mode
- unzip and run LG Flash Tool (you may want do disable ativirus, AVG detected it as dangerous)
- follow the guide from G2 (when you start flashing it will display error, just ignore it, at about 80% phone will reboot and at 99% you can unplug it and close flash tool

Follwing these steps I have my device up and working again.