[G3 General] Vega_Kangmin:
This method is for Kitkat, and lollipop.

Now i'm going to introduce how to unbrick your G3 Cat.6.

First, you need to download these files.

1. TOT,KDZ files

http://xdaforums.com/lg-g3/general/lg-g3-cat-6-f460-kdz-tot-download-t3470250

2. Windows LG Firmware Extract

http://xdaforums.com/showthread.php?t=2600575

3. LG United Driver

https://drive.google.com/file/d/0B2UHjr8om-8QT1RFME9UOHBEaTQ/view?usp=sharing

4. Debrick.img (You should download all)

http://1drv.ms/1LnSioU

5. Win32Diskimager

https://sourceforge.net/projects/win32diskimager/?source=directory

6. LG Flash Tool 2014

https://drive.google.com/file/d/0B1NxfQr9J2JUZnFQbGlaaU11Mmc/view?usp=sharing

7. ADB Fastboot

https://drive.google.com/file/d/0B1NxfQr9J2JUWExQdnk2RVlENXc/view?usp=sharing

Second, Put debrick.img files into Micro SD Card!

Extract the Zip file, and you can see

5 Debrick files.

and open the 'Win32DiskImager' Program.

and select the debrick file. and write.

After, the progress finished,

insert Micro SD card into G3 Cat.6

And Turn On your phone.

(Or Press Power + down button)

If you can see ADB Download mode, you can go to next method!

And If you can't see nothing on screen,

Try flash another file.

(like debrick 220-> debrick200 -> debrick180->...)

But if you can't see nothing (if you flashed these 5 files)

then you can't unbrick your G3 Right now...

Third, Extract your KDZ Files!

Open 'WindowsLGFirmwareExtract' Program,

and extract your KDZ files.

then you can see .dz file.

now go back to program,

Select Dz file, and Extract DZ files.

(Make sure you should check all boxes!)

And you can see .bin files.

Finished!

Fourth, Flash .bin Files into G3 Cat.6 (with using ADB)

Move ADB Fastboot files and Extracted Files into one file...

Like this.

http://imgur.com/a/8rRzV

Click SHIFT+M2 (Right mouse)

And click 'Open Command Window Here' on folder.

Then you can see the CMD.

Now Connect USB to your Phone.

and type 'adb devices'

after you can see demon started sucessfully, move on to next method.

NOW you need to replace your .bin files.

First, erase files in your phone,

and Flash all .bin files.

After you typed 'adb devices'

Type these all commands

fastboot erase aboot

fastboot erase BackupGPT

fastboot erase boot

fastboot erase factory

fastboot erase laf

fastboot erase misc

fastboot erase modem

fastboot erase persist

fastboot erase PrimaryGPT

fastboot erase recovery

fastboot erase rpm

fastboot erase sbl1

fastboot erase sdi

fastboot erase sec

fastboot erase tz

If you finished, type these commands

fastboot flash aboot aboot.bin

fastboot flash BackupGPT BackupGPT.bin

fastboot flash boot boot.bin

fastboot flash factory factory.bin

fastboot flash laf laf.bin

fastboot flash misc misc.bin

fastboot flash modem modem.bin

fastboot flash persist persist.bin

fastboot flash PrimaryGPT PrimaryGPT.bin

fastboot flash recovery recovery.bin

fastboot flash rpm rpm.bin

fastboot flash sbl1 sbl1.bin

fastboot flash sdi sdi.bin

fastboot flash sec sec.bin

fastboot flash tz tz.bin

IF YOU FINISHED TYPE/FLASH THESE FILES,

REBOOT YOUR PHONE (must eject the micro sd card)

AND IF YOU CAN SEE LG LOGO,

YOUR PHONE CAN ALIVE

Now you must do this last method.

Final, Flash KDZ File.

http://xdaforums.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848

If you sucessed to flash KDZ file...

now you can see your phone is alive...!

congratulation!

Q&A

Q. Why theres no debrick files for marshmallow?

A. I'm sorry, i only found debrick files for Kitkat,Lollipop.

(Now I'm Trying to find debrick for MM)

Q. Why i can't see my phone in ADB?

A. If you can't see, try to install LG United Driver.

Q. Your Grammar is SO BAD.

A. Sorry. I'm from South Korea... and that's why I CAN'T SPEAK ENGLISH WELL (Somebody Help Me..)

Q. Your explanation is SO BAD.

A. I'm sorry. I can mistake, and it's hard to write this method.

If you find Something WRONG, please Help me!

I'll Appreciate to your help! :D

Thanks For reading!