first of all I'm not taking any responsible for this, but it worked for me so.. you can at least try if you have no option left.
please note thatYOU WILL LOSE EVERYTHING on the internal storage of your LG G3!
IF YOU DON'T HAVE ACCESS TO DOWNLOAD MODE :
Please get yourself the right LAF file for your phone and insert it into the adb.exe and the fastboot.exe folder (if you don't know what I talk about please download Android SDK platform)
press Ctrl+Shift and right click inside the folder and choose Open Command window here (http://img5013.photobox.co.uk/118958...b3a604bc5f.jpg)
Now at the CMD window that opened Type :
fastboot erase recovery
PLESAE MAKE SURE YOU DOWNLOADED THE RIGHT LAF FILE FOR YOUR PHONE before attempting this (at the same android version)
fastboot erase laf
fastboot flash laf laf.img
Now you can accesses the download mode by restarting the phone.
Take the battery and the Sync cable out
while pressing the +Vol button insert the battery and the cable while continuing holding it
IF YOU HAVE ACCESS TO DOWNLOAD MODE :
Please download the TOT and .Dll files specifically for your phone from here: http://downloadandroidfiles.org/File...Stock%20Files/
after that follow this video and you're all good :