There are stock Android 4.1.2 Jelly Bean KDZ firmwares for the Korean version of LG Optimus G by model number F180 (S,K,L). These files might be helpful if they have bricked their phone or need to update their device or maybe for other purposes as well. Just follow the link to download the file!
Stock Korean LG Optimus G F180 S K L Android 4.1.2 Jelly Bean Firmware Download:
In case it’s the first time you want to flash your phone but still have no idea where to start doing it:
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Is it official? Or leaked 4.1.2 stock?
yes,it’s the leaked one
the official is around here: http://www.lg-phones.org/official-lg-optimus-g-f180-s-k-l-android-4-1-2-jelly-bean-firmware-download.html