This tutorial is for Hard Brick LG G3 (No recovery,No download mode) OR Download mode disabled by Killswitch.
Please Unzip Arhive
1) Install LG and Qualcomm Drivers, Restart computer
2) Take out the battery,Open your LG G3 and remove small metal and use short circuit looks like down image and plug usb cable with 3rd hand.
3) Open Device Manager in windows,Click on Ports(COM & LPT) and need to see Qualcomm 9008 if not appear, please repeat step 2
4) Now open with run as administrator BoardDiag, and put TOT file in image Extaction to "BIN" and Dir folder where you want to extract .tot. Press Extract and wait
5) After extract .tot,select AP Check and Emmc Test. AP Chipset select G2(MSM8974AC) and select correct Com Port (port see in device manager step 3). Target Dir select where you extract .tot from step 4
6) If you have killswitch and/or hard brick you need to format ALL PARITIONS. Need to stay 8-9 Hours.
7) After all, unplug usb cable and put battery, press power. Now your phone is alive again.
8) Now you need root for delete mcafee forever. Use Root folder easy to use.(Info in root folder)
9) After root, please install Titanium backup and remove mcafee. Restart your phone.
10) Now your phone have android 4.4.2 if you need 5.0 or 6.0 please use LG Flash Tool 2014(Info in lg flash tool folder)
Download Package From Here
1)Drivers (LG and Qualcomm)
5)LG Flash Tool 2014
6)Original .tot ROM