Install Marshmallow KDZ on LG G3 D855 Using Flash Tool


LG has started rolling out the Android 6.0 Marshmallow update to its last year flagship LG G3. The update is available with the build number 30B for the D855 variant and we are believing that the update for other variants of G3 would be imminent. The Marshmallow update comes with a lot of customization and performance optimizations. LG has tweaked the OS under-the-hood and also put their own custom skin over the stock Android OS.

The G3 users will receive the Android 6.0 Marshmallow update over the air via OTA update. However, if you’re eager to try the Android 6.0 Marshmallow on your device, you can right away download the official KDZ firmware and install it using the LG Flash tool. It is the most convenient way to install Marshmallow on your LG G3. Before proceeding with the procedure, first manually check for any OTA update from software updates section in settings. Go to Settings » About Phone » Software Information/Updates. 

If you didn’t see any OTA update listed in the Software updates menu, follow the below tutorial to install Marshmallow KDZ file on LG G3 D855 using the Flash tool.


  • The current Android 6.0 Marshmallow KDZ firmware is compatible with only the international variant of LG G3 with model number D855.
  • Install the LG Flash Tool 2014 (extract files if compressed) on your PC. This tool is required in order to flash the KDZ file onto your device.
  • Visual C++ Runtime Library is required in order to run LG Flash Tool 2014. If you have any problems installing or running the Flash Tool then install the libraries on your Windows PC. Click here.
  • Make sure you have the latest LG drivers installed on your PC. Get it from the download section.


Download | LG G3 Marshmallow Firmware (File: D85530B_00_1217.kdz)

Download | LG Flash Tool 2014

Download | LG G3 USB Drivers

Backup Your Apps and Data

Installing the stock firmware using a KDZ file will remove all your data and apps from your current ROM. So make sure you have a backup of all your apps and data. Also, transfer all your files from your internal storage to your PC as it may also get wiped out.

Install Stock Android 6.0 Marshmallow Firmware on LG G3

Here is a step-by-step guide to successfully flash the stock firmware on your LG G3.

  • Step 1: Put your phone into Download Mode. To do this, Power Off your phone first. Then while pressing both the volume keys connect your phone to your PC via USB cable. The screen will show download mode icon. Let the drivers be installed onto PC. If it fails for the first time, repeat the process (try holding just the Volume Up key).lg-g3-download-mode
  • Step 2: Open the LG Flash Tool 2014 folder and copy the KDZ file in it. If the Flashtool is compressed, extract it to get a folder containing the necessary files including the LGFlashtool2014.exe file. Transfer the D855xxx_00.kdz file, you have just downloaded, into the LG Flash Tool 2014 folder.
  • Step 3: Run LGFlashtool2014.exe file.


  • Step 4: Now you will have to make a bunch of selections. Select Type: CDMA (Do not worry about selecting this option as Flashtool is modified only for devices with SIM). Change PhoneMode to CS_EMERGENCY. Click the folder icon to browse your computer and select the D855xxx_00.kdz file.
  • Step 5: Choose CSE Flash option as we are installing a new copy on the stock firmware. This will format all your application data, format your system and could also wipe your internal storage. It makes a clean install. If you choose this method, it is highly recommended that you backup all your apps and data first. (Normal Flash option should be selected if you are on stock firmware and you just want to upgrade and do not want to lose any data. However, make sure you have not modified your system.)
  • Step 6: Once selected, choose Start on next window.


  • Step 7: Select your Region and Language and select OK button. Also clear phone for update registry.

Note: Disconnect from the Internet before you choose OK and also make sure your Antivirus is turned off for some time.


  • Step 8: Once the program has started, the stock firmware will get installed.


  • Step 9: If in case an error occurs, retry from Step 1 until success and remember to disconnect from the Internet when necessary. Once successful, the phone will restart automatically and choose click exit to quit the program.
  • Step 10: Once you see the LG Logo, that means you have installed the stock firmware correctly.

Once you boot into stock firmware on your LG G3, you can enjoy your latest Android 6.0 Marshmallow software.

Also see:

Root LG G3 D855 on Stock Android 6.0 Marshmallow and Install TWRP

  • Dinesh Kumar
  • b nguyen van

    you must connect internet in this step to show languages

  • sameh fawzi

    Originally Posted by maen.safadi

    Look at this thread [RADIO/MODEM] [d855] LG G3
    then choose another modem like 21C … I’m on 20A modem and everythink works well with me.
    Good luck Bro.

  • Muhammad Ovais

    Can anyone help me?

  • Muhammad Ovais Hi, I have LG G3 VS985 and I am trying to flash it. the KDZ file I am trying to use is VS98512B_00.
    But unfortunately I am experiencing this language issue.

  • Faraz

    Hello, I have LGD855-V10Z. can it be upgraded? if yes then how?

  • rakesh nagar

    i want to volte on my lg g3 32 gb d855
    can you help me
    i also try *#*#4636*#*#
    phone information i press message came this application does not work on your mobile.
    plz help

  • Do you resolved the issue?

  • zulfikar

    I’ve tried over and over again but always failed

  • Try again.

  • zulfikar

    please help me , I ‘ve followed the steps above correctly , but always failed to upgrade at 2 % , in LG G3 D855 International 32Gb ..
    I really hope your help , thank you

  • Job Stephen De Guzman

    Hi, can you please help me also? I don’t have whatsapp. Can you please message me through gmail instead? here’s my id: please please help me.. Thank you in advance! 🙂

  • Somanath Alegaon

    Hi Farooq, It never get through got tired… planned to return the phone..

  • Farooq Siddiq

    Somanth alegaon. I have faced same issue several times but didnt find any solution.. Do u find any way.. Plz let me inform.. Thankx.

  • patil kalpesh

    just msg me on my whatsapp no +917744894155 i will solve ur issue through teamviewer

  • patil kalpesh

    those guys have network issue after update just msg me on my whatsapp no +917744894155 i will solve ur issue through teamviewer

  • Jose Gelvis

    Guys I need help ,I updated my lg g3 D855 to Marshmallow and everything is good,But the problem is than I lose my signal,now I can not make eny call,if someone can help me it will be great,thx

  • dickson

    I have a lg g3 d855(france) and i am using it with T-mobile in USA. After almost 2 years without any issues, i started getting a “wifi turning on error” ( . I used your guide to upgrade to 6.0 from 5.0(lollipop), which worked fine. But the wifi issue still remains. can you please provide any suggestions?

    edit: When i drain the battery out >> then recharge the phone >> then start it >> wifi works fine. but if i setup a google account/gmail it crashes and takes me to the LG logon screen >> after this when the phone finishes booting up the wifi issue is back.

  • In many cases, such issues are fixed after installing a new firmware.

  • Hello i am going to update Android M via this tutorial but i have the WIFI problem my WIFI isn’t work will it solve after update ?

  • Roy Shiker

    Thank you, great guide – worked perfectly!
    can you provide guide to root quickly ?

  • Sounds weird! I have no idea about that. On mine, I didn’t notice any such thing. Try disabling the bloat apps from Settings> Apps.

  • prasanta das

    I have the same problm…….any one pls help me to fix this pls

  • Ali Khamis

    Hi Rakesh,
    I updated my lg g3 and everything is good, but since updating the mobile keeps deducting 18 cents programmatically and on every boot!!
    I installed few programs only and format it many times and contacted my network operater but still.
    Please help me if you have any clarification.

  • Somanath Alegaon

    I have tried uploading it but it getting stuck at 4% and I am getting error not sure why. I am using 32GB LG g3 and currently running on kit kat version. Let me know if you have come across such problem.

  • Somanath Alegaon

    Hi Rakesh, I have tried uploading it but it getting stuck at 4% and I am getting error not sure why. I am using 32GB LG g3 and currently running on kit kat version. Let me know if you have come across such problem.

  • Download the firmware from the page and install it.

  • Yes, you can update your device.

  • Thanks for sharing your experience with us.

  • Somanath Alegaon

    Cool… Thank you.. I will try…

  • chaouki kimouche

    Hi guys.. I have lg g3 d855 16 gb global
    i try to install marshmallow directly on kitkat 4.4.2 and it’s woork great .. No bugs no overheat no battry drean .. it’s work smooth and fast.. Thank u
    See screenshots

  • chaouki kimouche

    Hi bro.. I try it.. I have lg g3 d855 16gb.. i take the kdz file from lg official web site with my emei and flash it with Lg flash tool 2014 on kitkat.. And it woork great !! i do the risque and it work

  • Somanath Alegaon

    Hi team.. Currently my lg g3 is running on kit kat.. Can i skip updating lolli pop version and update marshmellow directly? Please reply if some one updated it… Thanks..

  • Bishop (Julian)

    guys i have lg g3 d855 international version.. should i flash my phone with this firmware or what type of firmware i should pick up ? tell me pls

  • indrajit chakraborty

    waiting for ur reply. plz solve my prob.

  • indrajit chakraborty

    mine is international, it was soft bricked but now it always in download mode when pressing the power button. plz anyone help me to recover my g3. tried lgflash tool [stopped in 15 sec. in both download & board mode], lgup, lg pc tools, lg mobile support tool but failed everywhere.

  • endleslie

    Do you resolved the issue?

  • endleslie

    Do you resolved the bootloop? How?

  • endleslie

    Whats Your phone variant? EUR or international? My phone variant is TWN, TAIWAN! Whats yout opinion? I try update this version with international kdz or i will create a brick?

  • indrajit chakraborty

    after clicking the start button, nothing happened. there showed no option to select my Region and Language. i followed every step perfectly, even disconnected internet & turned off antivirus. please help. my model is d855 10e with stock rom 4.4.2.

  • Jayaram Maiya

    Hi, i have LG G3 D855 was working with lollipop, it had problem of auto restarting the set, and i updated this MARSHMALLOW, now working fine, thank you, but now my cell got new problem that WiFi stops working, in the WiFi connected place it shows saved (not connected), it will works sometime automatically.
    Can i get solution for this? please help me..

  • Valentín Lms

    hi, i reccomend you make a correct hard factory reset, turn off the phone, pressing down volume button press on until LG logo, unpress on 1 second and press again on button, continue pressing until apear hard factory reset menu.

  • Valentín Lms

    in my model of LgG3 i can enter in download mode only pressing up volume button and conecting to Pc

  • filipe fernandes

    Thanks a lot, I installed it in my phone but still continue with bootloop, I made a hard reset before, changed battery and nothing solve problem! Can anybody help me please?

  • hardgore


  • Gabriel Baudouin

    I have the same problem as stuartejohnson !

  • stuartejohnson

    Please help me with this issue that it never exceeds than 2% while installing kdz file onto my phone. What’s the issue?????
    Please help!

  • Hardik

    My g3 do not go to download mode or firmware update PLS HELP ME PLS 🙁 (rooted)

  • helpme

    will it work if i dont have lg mobile support tool installed?

  • Same problem for me. How did you solve this problem ? If you have idea, please send a mail to

  • zamir yusof

    To anyone that going to follow this tutorial, please read comments posted below. My flash going smoothly thanks for some of the comments.

  • Huhster

    Neither LG nor Samsung allow formating SD as internal on MM.

  • Papprika

    yup.. its just need to be reboted. but my smart screen didnt work at all.
    i’ve done re booting turn it on and off repeatdly but it still didnt detect face and stay on when reading

  • Eliad Moses

    Yeah it works perfectly as well. I think your problem has to do with your connection settings which were rebooted once you upgraded your Android. I suggest you turn to you mobile company and see what they can do

  • Papprika

    did your mobile connection work?? mine not workin. no sign of H E or even LTE in my signal bar. and no mobile connection running.

  • Papprika

    well i sucsess installing android m as instructioned. but my mobile network not working.

  • Dan Kotovski

    Same here, any one have a solution =[

  • Anola

    i have done all the steps and my phone restarts all the time. It opens then shows the android icon for a sec then restarts again and does the same thing. What happened? I also try to do it again but the download mode does not open

  • Anola

    i have done all the steps and my phone restarts all the time. It opens then shows the android icon for a sec then restarts again and does the same thing. What happened? I also tries to do it again but the download mode does not open.

  • Felipe V

    Hi, I’m in custom rom currently, and I want to go back to stock (without root, so twrp o titanium backup aren’t an option), how can I make a back up of my apps an they data?

  • lol. Savage

  • Rishi Devanoor

    Thank you Naveen,. my sincere thanks for those how helped to upgrade my LG855 to Marshmellow,. thanks Again.

  • Vasilis Garyfalos

    I have one problem. after installing the marshmallows my sim card most of the times is not recognized. I tried reinstalling the firmware but the problem insists. any help would be useful 🙂

  • saifudin khuzema

    Can i do it on windows 7

  • saifudin khuzema

    When i download usb drivers it shows for lg v10

  • No.

  • saifudin khuzema

    Any problems such as camera will not work

  • saifudin khuzema

    I did not start till yet

  • Yes. Was it fast?

  • saifudin khuzema

    Did u flash it on 16gb variant or 32gb

  • saifudin khuzema

    Can i flash it on 16gb variant
    Pls reply fastt

  • Rico Cremer

    This works fine, thanks! Some people said that it did not work on windows 10, so I used the LG update tool with its compability mode set to Window 8 and didn’t had any problems upgrading.

  • Well… I updated to loli first.

  • Sunset Shimmer

    well that sucks I only got win10.
    my g3 is 4.4.2 should I update it to loli first to get this marshmallow?

  • Well… Doesn’t work for me… Just windows 8.1… On 10 i brick my phone…

  • Sunset Shimmer

    so windows 10 is a no no
    like 100% it wont work on window 10?
    will it mess up my g3 if I tried it?

  • Installing the LG Mobile Support Tool is not compulsory. It works fine anyways. I have flashed my G2 and G3 several times.

  • Fabrizio Milani

    You forgot one extremely important step before all of these, so i’m going to tell everyone:
    Install LG Mobile Support Tool, before even doing the step 1 listed above. Or else, when you get to step 7, both the phone and the lg flash tool will crash.

  • Ray Mulder

    This works fine. The important part of your article which is “Disconnect from the Internet before you choose OK” caught me napping 🙂 because you get an error message quite soon about “cannot connect to the internet – and you must try again later” then it occurred to me that I was connected to the internet and at first it confused me.
    So the flash tool is probably trying to connect to something it does not really need and if it does not find it it stops…
    Any way I disconnected the USB cable despite been told not to…removed the battery and then started all over again, this time turning the internet OFF ONLY AFTER you select the language.

    This works well and the other thing is the flash tool hangs at 99% but by then the phone is already booting into Marshmallow and you can just disconnect the USB cable and close the flash tool.
    Thank you.

  • darwin

    what are the differences between DIAG Mode and CS_EMERGENCY Mode when i am trying to install a new firmware

  • i has the same problem, i try on windows 8.1 instead of 10 and works ok!

  • Thanks man! after a lot of try, your tutorial works great on windows 8.1 not 10!

  • Fernando Caamaño

    Hi Rakesh. Thanks for answering. I did a hard reset and saw no difference. Installed the firmware again with LG Flash Tool and the same. It only allows me to format SD card as internal. What can I do?

  • nickvid

    how % i must disconnect to internet ? and how do I make disconnect ?

  • Daniel Moya

    hi… is it works on D855P (mobile in PERU.. Grettings)

  • Because both models are quite different.

  • layboo nah


  • layboo nah

    cna u tell me why!!

  • Reboot system and phone and try again.

  • Try a hard reset.

  • No.

  • layboo nah

    is it works on D850!!!????

  • Pingback: Root LG G3 D855 on Stock Android 6.0 Marshmallow | DroidViews()

  • Fernando Caamaño

    Hi. Today I installed this and the option to Format SD card as internal isn’t there. It only allows portable and I can’t move apps to SD 🙁 Is it a bug?

  • Fernando Caamaño

    Nicolas a ti te funciona la opcion de formatear la memoria micro SD como portable o interna? Porque a mi solo me deja portable

  • Muby

    Hello there,
    I just installed on lg g3 d855, my camera is not working!!! is there anything which i can do for this issue???
    Please help me out

  • Eliad Moses

    Installed it today, works perfect and clean. No more lags on my LG G3 D855. Thanks alot !

  • Nicolás Arnaez

    Soy de Argentina. Instalalo que anda sin problemas 😀

  • omar quintana

    Hi, where are you from? I want to install on the same phone to use it in Mexico

  • You can install any of them.

  • It’s a common issue with the Flash Tool, but you needn’t worry about it. The installation wa sucesful.

  • Stomiobeach

    I have a UK phone. I found two versions on XDA . An EU and a GLOBAL one. Which one is better for my phone. Thanks

  • Stijn De Mulder

    LG Flash tool stopped working at 99%, phone is booting normaly in 6.0. Is this a problem?

  • DoNz Aviles

    Bro try to off auto brightness or look at the display menu try to check other settings..

  • DoNz Aviles

    Sir i found a bug..the data icon did not appear when you open the to fix tha bug?..thanks in advance

  • DoNz Aviles

    thanks for the marshmallow update and also for tutorials how to update..kudos!!

  • Ryan Ahmed

    this android 6.0 is working gud.Sometimes display is blinking lil bit dont know why.

  • Yes, you will.

  • Alexander Axeell Szabo

    If Install this. Will I still get the regular updates from Android? ie. versions after 6.0 like 6.0.1?


  • Nicolás Arnaez

    Yes, it does. I already installed and it’s working properly. lol

  • Andreas Andersson

    It stop on 4 % when it says it will update my phone. plz help??

  • Glad to know it helped you.

  • Anand T

    hi thanks for the update , with this simple steps i unbricked my LG G3 D855 now it is working smoothly with android 6.0

  • Nope.

  • Nicolás Arnaez

    DOES IT WORK WITH G3 D855P?? Thanks!

  • Yes, obviously.

  • palle p

    Thanks. Flashing this will get me back to stock and untooted?

  • No need to revert to stock.

  • palle p

    I am running cloudyg3 2.5. Do i need to revert to stock rom (unrooted?) before flashing?

  • Yes.

  • No.

  • Magesh Sha

    Can i install this in AT&T Variant of LG G3?

  • Ryan Ahmed

    power button + volume down = screenshot 😛 i got dat

  • Ahmed Safwat

    Update phone application from
    Sittings/about phone / update center / apk updates thats will update screen shot and will work

  • Kelvin Paul Lopez

    I followed all instructions but still I’m stuck at 19% and it gets back from the start again

  • Great to know 🙂

  • Flash tool should be installed on the PC to push the update to your device

  • Not necessary. On the contrary, it is recommended that you have an unmodified system for a smooth installation

  • lemonboyz

    Hi. Do I need root access for this update?

  • Kelvin Paul Lopez

    in the phone or in the pc?

  • Rakesh Kumar Nayak

    Have you switched off your Antivirus as instructed.

  • Rakesh Kumar Nayak

    I also have checked the Quick circle case and it’s cool with the new changes.

  • Rakesh Kumar Nayak

    Thank You, Installed it and it is working 🙂

  • Ryan Ahmed

    i updated 6.0 in my g3 and it works fine.all the sensors r working …..but there is no screenshot feature in dis

  • Kelvin Paul Lopez

    hello I have a problem installing the kdz file. whenever it reaches 49% it says “image verifying failed” what should I do. thanks

  • Ahmed Safwat

    yes i think also your LG suite will save your mobile version and always you can update throw it.

  • Ahmed Safwat

    i tried it from yesterday i faced no problems ,

  • Ahmed Safwat

    Valid i tried it

  • Davis Pars

    Hello thank you tell me if the e KDZ file is valid for LG G3 32gb thank you

  • Ryan Ahmed

    is dis stable version ? if we get any other updates can we get those updates ?

  • Ryan Ahmed

    ohk…knock code is wrking so quickcircle case will be wrking obv.u can check in settings

  • Ryan Ahmed

    is dis stable version ? if we get any other updates can we get those updates ?

  • Ahmed Safwat

    All sensors tested except quickcircle as i don’t have the case battery work better than lollipop with me

  • Ahmed Safwat

    Knock code , compass and gps are working

  • Ryan Ahmed

    thank you very much.Will update my g3 to 6.0 lollipop is vry much headache due to battery prob will be replying u aftr updation

  • Yes, they will.

  • Ryan Ahmed

    knock code and all sensors r working in lg g3 d855 after update ?????

  • Ryan Ahmed

    in this 6.0 update all the sensors including quickcircle and knockcode will work ???? plz reply admin

  • Ahmed Safwat

    Work with me thanks

  • Marjan Maki Stanisic

    Sorry one more thing do i need to click on clear phone software update registry before selecting country and language

  • Marjan Maki Stanisic

    Ok thanks doing it right now

  • It will work on both.

  • Marjan Maki Stanisic

    Some advice is this same for 16gb and 32gb vesion

  • No…It’s an Official KDZ and you’ll continue to receive further updates

  • Kenny Hassan

    Hey there,
    Will this method stop us from receive next OTA?