Actually while suggesting following two, I am assuming that you do know many things and done them properly before.
1) Many are not checking the ADB mode is working or not. THE CHECKLIST IS VERY IMPORTANT. When you run ADB command to check devices with "stuff/adb devices" the device line should be seen. If device is not shown, the script will not work. The script will run without any problem if checklist is successful. Don't ignore this.
2) The second common problem is you may not be able to replace the file in LG folder in quick time. You have to be very quick, so the FOLDER should be open in advance. You can even open the folder in the beginning and minimize until it is required to replace. If you are late, the LG TOOL will flash original file and root will fail. Or you can open the folder immediately when it starts at 4% and keep looking for file to replace. As soon as you see 7th BIN file PASTE
it with 6th BIN, you already COPY
PS: My son is reading this, and literally he is laughing, saying, "Dad, you are teaching to kids or what?" Please dont mind him, he is just too young android kid. I say sorry on behalf of him. I am noob
, and you are noob, dont get angry on him.
And yes he flashed O2X quiet a few times before and L9 too.
He is 15.
EDIT: Added few checklists and explained why they are important to proceed.
JUST AN IMPORTANT REMINDER FOR ALL
STEP-BY-STEP NOOB'S GUIDE TO ROOT AND FLASH L9 WITH LELUS METHOD
(NOTE: This thread is only for NOOBS like me and for Junior Members.)
IF YOU CANT DO IT, DONT BLAME ME. WARNING: USE INFORMATION AND FILES AT YOUR OWN RISK. DONT EVEN MENTION ME IF YOUR PHONE IS BRICKED.
YOU WERE WARNED IN BOLD RED LETTERS ALREADY. OFFLINE KDZ FLASHING DOES NOT LOOSE PHONE DATA, BUT YOU MUST BACKUP IN ANY CASE.