How to Downgrade LG G4 H815 to 5.1.1 Lollipop


LG G4 got the Android 6.0 Marshmallow update back in the October. Unfortunately the update was available only for sometime and then LG shut down the Marshmallow Update for LG G4. Some of the users were successful to get the Marshmallow OS on their LG G4 and others who didn’t, can also update their LG G4 H815 to 6.0 Marshmallow through our previously published article (here). However there may be some users who want to Downgrade LG G4 H815 to 5.1.1 Lollipop after spending some time with 6.0 Marshmallow OS. So, all who are willing to downgrade LG G4 to 5.1.1 Lollipop stock firmware can follow this tutorial.

Downgrading LG G4 is pretty simple. We will flash the Lollipop KDZ file on the LG G4 H815. First let me tell you that it has been reported that Downgrading LG G4 from Marshmallow to Lollipop is not possible with LG Flash tool because it didn’t support the device running on Marshmallow. But no need to worry because there is the new tool called LGUP through which we will downgrade LG G4 to Lollipop. LGUP is new tool for LG devices that allows to flash KDZ firmware files and using it is easier than LG Flash tool. So let us proceed to downgrade LG G4 H815 to 5.1.1 Lollipop stock firmware.

Downgrading LG G4 to 5.1.1 Lollipop

Downgrading LG G4 to 5.1.1 Lollipop Stock Firmware

Today we will downgrade Lg G4 to the stock 5.1.1 lollipop firmware. If you are done with the Marshmallow OS on your LG G4 and want to get the 5.1.1 Lollipop OS back on your LG G4 then you should follow all the steps and instructions carefully explained below. We will install the 5.1.1 Lollipop KDZ file on LG G4 H815 via LGUP tool. However you should only do this process if your familiar this kind of process. Before proceeding read the necessary instructions and disclaimer.


  • This process is only for LG G4 Model-No H815. Do not try this any other phone. The process is for advance users only. If you are completely unaware of this process then you should not do this. If something wrong happens with your phone during or after the process then will not be held responsible. So, try this at your own risk. The firmware is official. You will lose root access, if you have, after the process, Thanks.

Necessary Instructions Before Proceeding

  1. Check the model of your phone by going to Settings>>About Phone>>Hardware Information. Make sure it is H815 then proceed.
  2. Backup your important data like photos, videos, contacts, messages etc to avoid data loss for safety purpose.
  3. Charge your phone up to 70% to minimize power issues.
  4. Install LG USB drivers on your PC.
  5. Your USB Data cable should be working properly.

What you Will Need

  • LG G4 H815
  • A PC or a Laptop
  • USB Data Cable

Top Free Apps to Improve Your Phone’s Performance

Download Required Files

Download:     5.1.1 Lollipop KDZ file for G4 H815

Download:     LGUP Tool

Download:     LG Mobile Drivers

Downgrade LG G4 H815 to 5.1.1 Lollipop Stock Firmware, Steps

To downgrade LG g4 H815 to Lollipop, follow the step by step instructions below.


  • Fist of all open the above link to download 5.1.1 Lollipop KDZ for LG G4 H815. There will be different lollipop KDZ files for different models. Clink on the H815 file and download Europe Open or Europe General or H81510c KDZ file for your G4 H815 on the PC.
  • Now extract the downloaded file if possible. IF not then let it be same.


  • Now download LGUP flash tool on your PC and extract.
  • You will get different files after extracting LGUP tool. Install both of the files on your PC. (install dll file first and then LGUP file)


  • After installing LGUP, launch the LGUP flash tool on your PC.


  • Connect your LG G4 to the PC. LGUP will detect your phone and it will be listed on the LGUP screen.

Connect LG G4 to LGUP


  • After that, click on the Upgrade option, and choose file path. Select the KDZ file that you downloaded in the first step.
  • You can also select Refurbish option and click on start but this will erase your data and you will undergo a clean downgrade process. This one is most suitable but you can select any option you want. Both works fine.


  • Now after all the above steps are done, press the Start button to begin the process and wait till the installation of the firmware completes.

Your device will restart automatically after the completion of the process. Now you have successfully installed the 5.1.1 Lollipop OS on your LG G4 H815. Hope you like out tutorial to Downgrade LG G4 H815 to 5.1.1 Lollipop. If you have any problem then ask in the comments section below. Now its time to go. Bye!!

Downgrade G4 H818P Dual to Lollipop

If Device is Stuck at LG Logo or Boot Screen

If your device stops at Boot Screen or LG Logo or downgrading then you will need to hard reset your LG G4. By doing the hard reset all your data will be lost. For solving the problem, follow the instructions below to hard reset your phone.

  1. First of all turn off your phone.
  2. Now press and hold Power+Volume Down buttons for few seconds.
  3. When the LG Logo appears, quickly release the Power button only for a second and again hold the Power button.
  4. After that Factory Hard Reset Screen will appear and then release all the buttons.
  5. Now press the Power button to proceed and press it again to confirm the task.

Your phone will return to factory condition after performing hard reset and it will boot up normally and your problem will be solved. Please note that your phone may take some time to show up home screen. Now our tutorial to Downgrade LG G4 H815 to 5.1.1 Lollipop ends here. Thanks for following.

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  1. Hi i have Lg G4 H735 and i have upgraded my android but i want to return back to lolipop.
    In your list there is my phone’s model.
    Can you help me out?? Plzz

  2. Hello, Thanks for this help.
    Just before is start, will this work on H815k? I have a LG G4 from Australia running 6.0.
    What kdz will i need for my 815K?

    Thanks again for your help.

  3. Hi, Recently I have purchased LG G4 H815 through eBay. The Seller was claiming that its an unlocked international version but on imei-check, I came to know that its a Taiwan version.
    Now, I am coming to my actual problem having with this phone. For initial two days it was having full signal strength & there was no problem with data & voice communication but after that now there is no signal on my phone & there is other issue with WiFi/Bluetooth & all APPS are working smoothly on Wifi. I tried SIM swap + almost all stock firmwares (Europe General, Europe OPEN, Hong Kong, Taiwan 10B & 10C downloaded through XDA-forum. Kindly guide me how to solve this network signal issue.
    Thanks in advance

  4. hey dude!

    i was very heppy when i was able to update to 6.0… after 1 day i recordnised that the battery is empty in about half a day…

    now i tried your tutorial and my phone got stuck by booting… i’ve made a hard reset and now i have everything i wanted: lg g4 android 5.1…

    Thank you m8!

  5. Hi, I wanted to know is there a downgrade available for the Lg V10? If not then can I use these steps on my V10? Thanks

    • what acces ?? and btw i want to make it too 5.1 .. i am in bulgaria what i need to download Europe OPEN or Europe GENERAL ??
      !!! VERSION OF PHONE (H815)

      • Hi Hadi,
        Download any file you like. Both will work fine as you have the H815 model. Go for it with care and you will succeed in downgrade. You can seek help from me anytime you like.

  6. Hi I’m using an H812. Downgrading 6.0 to h81210n using LGUP. However I’ve been stuck at 9% with the step _prepareAfterDload download for 41 minutes now. Should I be concerned or is this normal?

  7. does anybody know where to get a stock (not root) KDZ file for Canada Rogers Carrier for lg g4 model h812. There is only telus and videotron available from the links on this page. I NEED LOLLIPOP BACK! please somebody help me…..

  8. Hello I have the LGLS991 from sprint is there something I can do? I found these KDZ file: LGGS991ZV5 but my firmware version is ZVB is that a problem? Is there any other method I can use to downgrade to Lolipop? Marshmallo ruined Cinema 4k app and all of 4k video apps and I lost slow motion videos from the original camera app. Thanks!

    • Hi Joel,
      If you found comaptible lollipop kdz file for your G4 LS991 then you can try this procedure. But I think your G4 model has perhaps diffrent downgrade method. I checked lollipop files for your G4 and I found .tot and .dll files.

      • hehehe I think it is not possible right? Since LG Flash tool won’t be recognized on marshmallow, I can’t use tot method anymore. Anyways i can’t roll back from ZVB to ZV5 without killing my phone XD Thanks for the Answer! 🙂

    • Hi Hakim,
      First if your Phone is running stable and good on Marshmallow then I suggest you not to downgrade but if it is causing problems then Yes this method can be used on your G4 H815 even if it is preloaded with 6.0.

  9. Hi my lg g4 H818p was upgraded to android 6 it’s very bad! I decided to downgrade my phone but I’m very scared I have kdz file and lg up but I can’t findout in step 1 i select refurbish or upgrade please help me thanks

  10. Hi, everybody.

    I just got the LG G4, it was already updated to 6.0. Wow… it’s terrible! the problem is that it cannot be downgraded. I’m getting tired of searching how to downgrade it to 5.1.1 but it is not possible.

    Any help how to do it?


    • hello, I have the exact same problem as you. Did you figure out how to solve the problem in order to improve the crappy battery life? thanks in advance.

  11. Was wondering. Does doing this stop my phone from receiving future OTA updates?
    And, has Marshmallow been updated so that the battery drain is no longer an issue?

    • No, doing this will not stop your phone from receiving OTA updates because the firmware that is used to downgrade is official. Secondly I think currently no newer version of marshmallow on G4 H815 is availble yet.
      Subscribe to get all the latest updates on LG G4.

      • Hi, if as you say, my phone should still receive OTA updates, shouldn’t it be telling me that I’m due for an update to Marshmallow again by now? Not that I want to yet, until the battery drain issue has been well and truly fixed, but just asking.
        Also, I’ve noticed that the stock rom I’ve flashed as per your instructions above, is not the same version that came with my phone, any comment on that, and, can I find the EXACT version somewhere?

        • Hi David, It doesn’t matter if your phone does not has the exact same firmware it came with. The thing is that firmware running on your phone should be stock and official. Your phone is now running on official stock firmware. So, it is fine. However if you want to find exact firmware then it depends upon country. Find the lollipop firmware released for your country and flash it on your phone. Thanks,

    • Hi,, The method is same but you need a different kdz file for H815P model. Open the link above to download KDZ file. From there you need to click on H815P folder and download any KDZ file H815P10e_00.kdz or H815P10g_00.kdz. For installation of the file, follow the same procedure. But do this at your own risk only.

  12. I just had terrible battery leaking after the Marshmallow update. Your tutorial just saved my phone. …and I also had to hard reset it after downgrading.

    Many thanks, and good luck!

  13. Hi, I had been waiting with excitement for Marshmallow, and finally got it a couple of days ago. What a disappointment! Not only did I not notice any improvements, but my battery life has crashed! Today it dropped from about 85% to 52% in two hours, with the screen closed!
    So I was very pleased to find this tutorial on how to go back to lollipop!
    Does this v5.1.1 come with all the LG software etc?
    Anyway, great tutorial, Faiq

    • In my case (i commented earlier), downgrading from Android 6.0 to 5.1.1, the phone asked me to download the LG software apps. So yeah, they’ll be included.

      • Yep, done that, and am so glad! Battery life immediately improved! Charged phone to 100%……left it overnight (turned on), and next morning still at 100%!!……had to do a hard reset tho, as phone wouldnt boot, but hey, all the better for that I think!

  14. Thank you so much, Faiq Ahmed! You made my day!

    I’ve been searching from the net, solutions for my Android 6.0 (LG G4) phone, for 5 days without getting a result because my phone isn’t rooted. So after reading + doing as you mentioned in this article, it really helped me to get my phone back to Android 5.1.

    My phone had really bad sync problems when using Android 6.0 but they’re gone now!

    At the time i was downgrading my phone: My phone got stuck at the LG logo + a blue LED light on, so i got the battery off and put it back and hard reseted the phone. And now i’m a happy owner!

    PS. Thank you for replying to my previous comment and thank you again for helping me! I wish you the best!

  15. I’m in London and just received the V20d-EUR-XX OTA update. It says that it “improves battery life and installs other fixes from Google”.

    It has been less that 24 hours, so I cannot comment on the battery life just yet. However, my G4 can once again pair with my car via Bluetooth (it used to go in to a “crash loop” after I installed Marshmallow).

    I’m going to sit tight with this latest update for a while and will see how it goes.

  16. Do i need the root access to be able to downgrade my LG G4?
    I haven’t rooted my phone and i want Android 5 back, i shouldn’t have upgraded to Android 6.

  17. Not sure if I have missed something, but LGUP is looking for a .tot file? Do I need to extract the .kdz file 1st, and if so do what do I use to upzip it. WinZip or 7zip can’t extract it? Thanks in advance

    • Hello Chris Buston
      If the fie is already kdz then you don,t need to extract it. And make sure that .BIN File is checked,which is below in the file type. If still problem occurs then uninstall lgup and reinstall it. Instal dll file first and then lgup.

  18. yes works for me wish i never updated to marshmallow
    did get stuck in boot loop but just do a hard reset
    and all is ok

  19. The Marshmallow update was killing my battery, so I tried the instructions above. My LG G4 is now bricked. The “Life’s Good” logo is showing, and the top LED is glowing blue, but nothing else happens.