Kdz flashing on "kdz flasher 2014" thread and tutorial on g2 forum at xda! No, only e975 kdz. Not f180!
Save all files, data etc on pc anf flash it with reset/wipe (option in flasher)
After flashing: set up, root it with towelroot.com and unlock bootloader with freegee (gplay app) then u can choos there recovery vut replace it with philztouch. Thread in original android developement in this optimus g forum i think. U will find gdrive link. Ectract zip and flash it in flashify or directly the zip in recovery
For questions, use search option and look in this forum! I helped u enough
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