How To Root LG F400K G3 LTE-A



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How To Root LG F400K G3 LTE-A

Rooting the Android phones always provides the enhanced features to any phone. You can get rid of the irritating or useless pre-installed apaplications, advertisement, mute notifications etc. All you need to do to get these enhanced features is that the LG F400K G3 LTE-A must be rooted “successfully”. Why am I highlighting the term?! Yes, because successful rooting is the important thing. One wrong move, you will have a device bricked in your hand. Read More : Stock ROM Vs Custom ROM



Today, I’m going to guide you through the detailed steps to follow to root your LG F400K G3 LTE-A device. But, rooting your device right way,



I want you to know some things which are really important.

  • It can affect the warranty, since the warranty gets void for rooted devices.
  • A wrong step in not following this guide properly might brick your LG.
  • And sometimes, Rooting might also result in affecting battery health. So, if you are too conscious about battery health, then I would not recommend this to you.
  • Read More: Enable OTG support for your Device

There are different LG F400K G3 LTE-A available and you can root them with below apps and Software.



  1. LG F400K G3 LTE-A with stump root. (Recommend Android 4.4 and earlier)
  2. LG F400K G3 LTE-A with iRoot
  3. LG F400K G3 LTE-A with OneClick Root

I’m going to provide detailed solution for each of these different category devices.



Steps to root LG F400K G3 LTE-A with Stump root

These steps are for the devices with Android versions 4.4 and earlier. Usually these devices were manufactured and rolled down in to the market from 2012 to 2014.



Step 1: 

Settings -> Security -> Unknown sources, Allow your phone to install non-market applications. You don’t have to get scared. This is just for installing Stump root APK, which is must for rooting. Read More : Ad IR Sensor for your phone – TV Remote.

Root LG phone

Step 2:

After completing the step 1, download the stump root APK application on your LG F400K G3 LTE-A.

Step 3:

Go to file manager on your phone and find the stump root file and install the application. See the Download Folder

Root LG phone

Step 4 : 

open the application and click on “grind” option.

How To Root LG F400K G3 LTE-A
How To Root LG F400K G3 LTE-A

Step 5: 

Wait for some time as the process takes some time to complete, and then reboot your LG F400K G3 LTE-A and it should work successfully.

Step 6,

you can make sure that your phone rooted or not using these simple tips..  If there is a App Called “SuperSu” then your phone is Rooted. If you have doubt again? then use This App. it will tell you whether or not the phone has root access.


Root LG F400K G3 LTE-A Phone with iRoot (Android 5 and above)

Step 1:

  • Enable the USB Debugging
  • Download and install iRoot on your computer. Connect your LG F400K G3 LTE-A which is yet to be rooted to your computer through USB. Run the program.

How To Root LG F400K G3 LTE-A
How To Root LG F400K G3 LTE-A

Step 2:

you will get a screen shown below when the device is connected to the computer. This will enable the device for rooting.

Root LG phone

Step 3:

Click on the Root option and wait for some time. Reboot your LG F400K G3 LTE-A once done, and it should work smoothly.



Root LG F400K G3 LTE-A Phone with LG OneClick Root

Some times does not support iRoot or stump root. In such cases this type of rooting comes in handy.

Step 1:

Connect the LG F400K G3 LTE-A to be rooted to the computer. Drag the notification window down. Select Media device. This should work successfully, if not, then switch to PTP mode. This step is to enable the USB Debugging on your LG Device.

Root LG

Step 2:

Download and Install LG F400K G3 LTE-A drivers on your computer.

Step 3:

Download LG F400K G3 LTE-A OneClick Root. Decompress the file and install the software on your computer.

Step 4:

Click on start option to root the device. Wait for some time for the process to complete. Reboot your LG F400K G3 LTE-A once done.

How To Root LG F400K G3 LTE-A
How To Root LG F400K G3 LTE-A

Congratulations on rooting your LG F400K G3 LTE-A successfully! Read More:I have rooted my phone. Now what is Next?

Check If LG F400K G3 LTE-A Is Rooted Properly

you can make sure that your phone rooted or not using these simple tips..  If there is a App Called “SuperSu” then your phone is Rooted. If you have doubt again? then use This App. it will tell you whether or not the phone has root access.

Fix “Unfortunately, Stump has Stopped” Error

This is not related to Rooting process. This is a error of your phone’s cachs. So you have to delete those caches. then this problem will be settle.

1. Reboot/Restart your phone. works?
2. Delete/erase cache and data in kinguser.

Su binary needs to be updated LG F400K G3 LTE-A

First of all Full unroot your device and remove roots apps and restart the phone.  follow this guide line step by step with new files.

I Can not OTA update after rooting?

After you rooted your phone, then you can’t get update automatically. If you want? then go to this link

After root some of Features Not working properly

: I rooted my phone and Now, WiFi, Mobile data, Bluetooth, sensors, keyboard, speakers,MIC, Host-spot and GPS does not work properly.

A : It seems, Something gone Wrong. When we are rooting these kind of things may happen. All you have to do is Install Stock Rom and then again try to root your device.

I Can Not Root My LG F400K G3 LTE-A

Kingroot is always updating application. some times your device is not supported by app.. However, If you are still unable to root your phone, You have two options.  one is, try root manually or use different Root app – Best Apps that support any phone


LG F400K G3 LTE-A stuck at boot, continuously restarts,

Your Stock Rom image or Custom image has been damaged so you have to install Stock Rom or Custom Rom again. Is Sound big? Don’t worry we have step by step dedicated Posts here.



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