Root LG G3 Marshmallow 6.0 using TWRP and Install Magisk (All Variants)

LG G3 comes with a KitKat version. It received Two Major upgrades from LG. After Marshmallow 6.0 version, LG stopped major upgrades and security patch updates. Most of the people who bought this mobile use this as either a primary or secondary device. If you root your mobile, you can flash Custom ROMs. There are some official Custom ROMs that are also available. In Specific Lineage OS 16.0 based on Pie 9.0 version available for this device. Official release means you will receive regular patch updates and Major upgrades. There are two methods available in this process. You can use the LG One Click Tool or TWRP method. If you use the TWRP method, after the first boot, you should Install Magisk. When you use the LG One Click Tool method, you can use the default SuperSU, or you can replace Magisk.
LG G3 with Blue Water Colour Background

Why should you Root LG G3?

We appreciate the hard work of the TWRP team and XDA Developer- avicohh. Without them, this Root method is not possible. Your mobile has a minimum of 2 GB of RAM. It is enough for normal usage. But, LG stopped Security patch updates. Also, It is based on Old OS, So we can’t expect Many optimizations. It has a Qualcomm MSM8974AC Snapdragon 801 processor. So, If we Install Custom ROM, We can expect some Improvements.

Due to Poor RAM Management in Old device, you will feel laggy. If we optimize correctly with correct Custom OS after rooting, we can see some Improvements. So, after root, I can expect a Lag-free experience? Probably. Also, if we hibernate and eliminate a lot of unwanted apps and optimize some apps, your device is hardware limited. But, within these limits, we can enhance the performance by 20-30% compared with your old usage. If you use Lite weight Custom ROMs, you can expect a 40-80% improvement in performance based on what custom OS you are choosing.

How to Root LG G3 Marshmallow 6.0 (D855 (Europe), D850 (AT&T), D851 (T-Mobile), D852 (Canada), LS990 (Sprint), US990 (US-Cellular), VS985 (Verizon Wireless), Unlocked)

LG G3 International Variants comes with a flexible bootloader other than some locked devices. Example- In Samsung, Verizon mobiles come with locked Bootloader. We can Unlock your Bootloader using the script. This means that different smartphone variants can be easily rooted. Also, the device can accept to install TWRP recovery or any other custom recovery file/app alike.

TWRP recovery is a custom recovery file that must be installed on your devices because you can root them successfully. In this article, we explained the easiest method to follow and install TWRP recovery on LG G3. However, the tool required for rooting this device is the Magisk App.

With the help of TWRP Recovery, you can quickly flash the latest version of Magisk into your LG G3 to gain root access. Before sharing the tutorial, you may want to know that, with the TWRP recovery present on your device, you can easily install any custom ROM or firmware. Does it seem complicated? Relax, everything will be explained succinctly in bullets.

Things to check out for;

  • Make sure your device battery percentage above 50%

  • Backup your current files and data, full data loss process (save them on external storage).

  • This method will Unlock your Bootloader.
  • You should not disconnect your mobile during the whole process.
  • Don’t close the LG One Click Tool, If you select Method 1. It should run until the process done.
  • You should use a Laptop or Power Backup PC. The process should not be interrupted in the middle.

Pre-Requirement StepsOnePlus 6T OEM Unlock and USB Debugging

  • Enable USB Debugging Mode and OEM Unlock on your mobile. To do this; go to settings >>> about >>> Tap on the “Build Number” 7-10 times consistently to enable “Developer Options,” then go to the “Developer Options” and enable USB Debugging Mode, OEM Unlock. There is no complicated process in the LG G3.

  • Download the ADB drivers and LG USB Driver. Install both files on your PC.

Method 1: Flash TWRP and SuperSu using LG One Click Tool

  • Open One-Click Tool. Connect your mobile to PC using USB Cable.

LG One Click Root Script Start

  • After you get the “Device detected” message, the SuperSu Script should run within a few minutes. If the script didn’t run, Unplug your mobile and restart the whole process.

Root LG G2 Script Success

  • The script will install SuperSu on your mobile successfully after the flash follows on-screen Instructions.

LG G2 SuperSU Flash Success

  • Press ctrl+c and Type “N” and press enter to Reboot your mobile.
  • You will be booted into Recovery mode. The app already pushed the SuperSu file. So, there is no need to transfer the data on your own.


  • After booting into TWRP, Select Wipe->Advance Wipe->Select Cache Data.
  • Select-> Backup ->Take complete Backup.
  • After the Successful Backup, return to the home of TWRP and Select “Reboot System.” Now you have rooted mobile with the SuperSu app. If you want to install Magisk, move to the below steps. If you are satisfied with the SuperSu app, you can ignore the below step.

Method 2: Flash TWRP using ADB and Fastboot

  • Download TWRP Official File (AT&T, Canada, Korea F400, Sprint, T-Mobile, Verizon). You should select the latest TWRP file as per your carrier. Copy this file to ADB and fastboot folder.
  • Switch off your mobile. Connect mobile with PC using USB Cable.

LG G3 Download Mode

  • Press Volume Up+ Power Button to enter into Download Mode.
  • Launch a command prompt and enter the following commands one by one.
  • adb shell
    dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/recovery
    dd if=/sdcard/recovery.img of=/dev/block/platform/msm_sdcc.1/by-name/recovery
    adb reboot recovery
  • Don’t boot into the standard OS. Move to Magisk Installation steps.

Install Latest TWRP Using the Flashify app (Optional)

  • If you need the latest version of TWRP, you can Install the file using the below method. If you feel you are ok with the Old version, you can ignore this step.
  • Open the Flashify app and Install the TWRP. Don’t Boot into recovery using Flashify app. Switch off your mobile and boot using Volume Down+ Power Button keys. You should not boot into your mobile until Magisk installation using TWRP.

Install Magisk on your LG G3 using TWRP


  • Download Magisk.Zip (Latest Version) and Copy it to Your External SD card storage.

LG G3 Recovery Mode

  • Switch off your mobile. Boot into recovery mode-> Volume Down + Power Button.
  • Select Wipe->Advance Wipe->Select Cache Data.
  • Return to Home of TWRP select Install.
  • Select Magisk.Zip.
  • After the Successful Installation, Reboot your mobile.
  • You can also install Magisk Manager in your Mobile Applications If you can’t find the Magisk app in the App Drawer. Install a Root checker to verify your Root Status.

LG G3 Root Checker Result

  • Uninstall SuperSu app If you root with Method 1. If you use Both the Magisk and SuperSu, It can cause some trouble.

What More?

LG G3 has a minimum of 2 GB RAM, and it is a Flagship phone when it is released. Now it can be a Good Mid-Range phone in this latest Android World; The RAM is more than enough. If you don’t know How much RAM you need, Nowadays, 3 GB RAM is enough for regular usage. There will be no Regular Major updates and monthly updates from LG for a long time. Compare it with Old devices. Some models are still receiving updates. So, you know what you are doing and the real purpose, you can root your device. By rooting and flashing custom ROM, you can use New Android versions without any lag issues.

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31 thoughts on “Root LG G3 Marshmallow 6.0 using TWRP and Install Magisk (All Variants)

    • It works well with all US Variants. Until the Marshmallow version, We can root our device using Tools. Your mobile is Marshmallow version. Yes, we can do that.

    • We tried this on the D855 Model. As per the Tool developer Instructions, It should work well with other variants also. If this is your first time on Root, you should check all the steps. Take Complete backup before proceeding. May I Know your purpose for rooting? If you worry about Rooting may cause any problem, I can suggest some alternative methods based on your goal.

  1. If you don’t see supersu installer scripts run within about a minute, then root failed after this. It says root failed.

  2. Using method 1, the process fails at the point where SuperSu should load. Tried numerous times. I tried running su as instructed in way 2 in the cmd.exe window, but it doesn’t recognize that command. I’ve got the complete path to where the su files are located (tried both arm and armv7 folders). Any ideas?

    • In the second method, We prefer Magisk, not SuperSu. The Su command is used to get Superuser permissions. Copy the recovery—img file into adb and fastboot installed folder.

      • I was only going to the second method to get the commands to put into cmd.exe.
        I can’t find a recovery img file anywhere on the hard drive on this laptop (Searched for *recovery*.*). I did find and put a copy in the folder that contains adb.exe. Super Su script still doesn’t run, and root failure.
        Any ideas why it won’t run? I appreciate any help you can provide.

        • You can download the TWRP file from the Official Link. We already attached it in the post. After the download, place this recovery file in the ADB folder.

          • Are you referring to the me.twrp.twrpapp-26.apk file? I tried putting a copy of it in the folder with adb.exe in it. But is still failed root when running the one-click script. I tried running me.twrp.twrpapp-26.apk using the command prompt, but there’s no app associated with that type of file.
            I hate to keep bugging you, but do you have any other ideas?

          • I am talking about method 2. Place the downloaded official TWRP file inside the ADB folder and try to flash using commands.

  3. Still not working. I opened a command prompt, change directory to c:\adb, and tried running the su command. It doesn’t recognize this as a valid command. If I try running adb su command or adb -su command, all it does is scroll the adb help menu. I do not understand how this is supposed to work.

      • Hey, Thanks for the guide;
        Also having the problem that neither of the methods works for me. Got the same problem as many others here:
        su -> command not working. Why? Because the phone is not rooted! (su – super user a.k.a. acquire root access on the shell)
        Some suggest downgrading the phone’s Software Version to make rooting the device work again. Then this awesome guide here should also work again 🙂
        Best / Tom

  4. I tried using this on an LG G3 D855. After running LG Root Script.bat, the phone appears frozen. Says Firmware Update. 0% complete.

  5. How critical is the OEM unlock as I can’t see it under Developer Tools on an LG G3 D855? I tried Method 1, and it hung at the stage when SuperSu is meant to run but doesn’t. Mobile shows a download screen, but no progress occurs. I hope I can get this to work thanks.

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