Root Samsung Galaxy A40 SM-A405FN/FM/S Android 10 using TWRP and Magisk

Nowadays, most Android users who rooted their mobiles prefer custom ROMs because of its features and control. Sometimes because of the custom ROM features, they will root their new mobile within a few months after the purchase. So, the trend where everybody thought the root and custom ROM is for old mobiles is over. So to install custom ROMs, you need a custom recovery. Here we will guide you through how you can Root your Samsung Galaxy A40 Android 10 using TWRP recovery. In the old days, we user SuperSu for Superuser permissions. After Magisk releases, because of the advanced features, We use Magisk Manager. Because of the Samsung security feature, we have to flash the Vbmeta file along with recovery. So the following method may have additional steps compare with old techniques.
Samsung Galaxy A40 Home screen in the hand

After root, you will lose official updates. You have to update your mobile manually. So, Before proceeding with the process, you should know why you need to do it. So, If you are a regular user, you can try some alternatives for your purpose that doesn’t require root. When you are a regular root apps user and developer, you can follow the below guide to achieve root on your mobile.

Should you need to Root your Samsung Galaxy A40 Android 10 version?

It would help if you had a strong reason for rooting. Samsung Already released One UI 2.0 based on Android 10 and is already optimized. You have More than Enough 4 GB RAM to use daily apps without lag for years. Yes, I Know, RAM maybe looks like not enough because of the Samsung Heavily customized OS. But, Trust me, One UI is far better than other Custom Skin OS. You can use this device without lag for years until Samsung mess with some Bloatware. Beyond that, not go reasons, you are a frequent user of some root apps, or you are a user of some Custom OS, you can proceed further. But if you want to root because everybody is doing, I advise you, don’t root If you didn’t have any experience. For regular users, It can become a Nightmare.

How to Root Samsung Galaxy A40 Android 10 One UI 2.0 (SM-A405FN, SM-A405FM, SM-A405S)

First of all, thanks to the developer for the Root method-  ponces and topjohnwu – this genius is one who discovered and maintaining Magisk. Samsung Galaxy A40 International variants come with a flexible bootloader. It means that the smartphone can be easily rooted. Also, the device can accept to install TWRP recovery or any other custom recovery file/app alike.

Also Read-  How to install Magisk Manager on Motorola Moto G Power 2021 XT-2117 Android 11?

In the below method, we are going to Root this device by using TWRP and Magisk. The process uses Unofficial TWRP. You can install Official TWRP using the official app when it is released. 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 Magisk on Samsung Galaxy A40. However, the tool required for rooting this device is the Magisk App.

You can flash TWRP once it is available. With the help of TWRP Recovery, you can quickly flash the Custom ROMs into your Samsung Galaxy A40. Before sharing the tutorial, you may want to know that, with the Magisk present on your device, you can easily install any root apps. Does it seem complicated? Relax, everything will be explained briefly in bullets.

Samsung Galaxy S23 Renders
Samsung Galaxy S23 Renders

Things to check out for;

  • Check your device model number.

  • You should Backup your current files and data- Full Data Loss Process (save them on external storage).
  • Install Latest Magisk Manager.
  • Make sure your device battery is above 50%

  • You cannot use Samsung Pay, Secured folder, and some official apps from Samsung.
  • You can’t update your firmware; to get new firmware, you must follow the below steps with the latest firmware.
  • Read the full tutorial before the process.

1. Unlock Bootloader

Enabling developer option

  • 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 and OEM Unlock. There is no complicated process in the Samsung Galaxy A40.

Samsung Galaxy A40 A405 Download Mode

  • Switch off your device. Enter into Download Mode-> Volume Down+ Volume Up and Connect your mobile with PC using USB Cable. When the Download mode warning screen Appears, Press the Volume Up button to unlock Bootloader.

Samsung Galaxy Bootloader Warning Screen

  • The above process will wipe your user data. After Setup your device, Please recheck the OEM Unlock in the settings. Sometimes It Will Lock Again.

2. Necessary Download files

  • Download and install the Samsung USB driver to your computer system.

  • Also, download the ODIN software. Select the above Oreo version in the ODIN list. Install ODIN on your PC.

  • You can use Phone Info to know your firmware version.
Also Read-  Download Samsung Galaxy S22 5G SM-S9010/B/E/N/U/U1/W Android 12 One UI 4.1 Stock Firmware

3. Preparing Patched Vbmeta Image file

Samsung AP Extracted files

  • Download 7Zip-ZS, LZ4, and Install both on your PC. Extract the files in downloaded firmware using 7Zip-ZS. You will get four files. Click on the AP File and Extract again. You will get some data along with the vmbeta.img.lz4.

Convert lz4 file to img

  • Copy the vmbeta.img.lz4 to LZ4 Installed folder. Convert the lz4 file to .img file by dragging the .img file to the lz4 application file. You have to drag the file to that application. The script will automatically convert the file to .img format. After the convert, Copy the Vbmeta — img file to your mobile.
  • Download Magisk Manager (Download Latest version) or Magisk canary and Install it on your mobile. Open Installed Magisk and Select Install in Magisk; it will ask For a zip file and Patch Boot Image File. Select the Boot Image file.

Magisk Boot Image File

  • Navigate to your copied Vbmeta Image File and patch the file.

Magisk Firmware Patch Process

  • Wait for the process to complete; in the end, you will get a magisk patched .img file. Rename this file into the Vbmeta.img again.

Samsung Magisk Patched TWRP Files

  • Now copy Vbmeta.img and Kernel.img files to your PC. Drag those files into the downloaded TWRP.tar file. Now you can see there are three files within the TWRP.tar file. Don’t extract the data. The three files contain a single .tar file that should be flashed using ODIN.

4. Flash TWRP.tar using ODIN

Samsung Galaxy A40 A405 Download Mode

  • Connect your USB cable with PC. Switch off your device. Then, enter into Download mode. To do this, press and hold Volume Down+ Volume Up Buttons and Connect Your Mobile To PC via USB Cable; after Samsung Logo Appear, Release all keys.
  • Press the Volume Up button to continue when you see the warning message.

  • Now, connect the Samsung Galaxy A40 mobile to the computer via USB cable.

  • Launch the Odin app on your computer. If the device is detected by this app (Odin), it will show you a message that reads – added!!!

ODIN Added Message

  • However, if the device is not correctly connected to the PC, you won’t see this message. So, you have to check the USB cable if it is reasonable and reconnect the device.
  • After connecting the Samsung device, click on the PDA/PA/AP button to browse/search and get the TWRP from where you saved it on your PC. Also, navigate to “options” and Un-tick the Auto-Reboot.

Odin Auto Reboot

  • Click on “Start”

  • Once the file is loaded into the device, reboot your device.

Also Read-  Root Google Pixel 5a 5G Android 12 using Magisk

Samsung Galaxy A40 Root Recovery Mode

  • Kudos, you have just Installed the TWRP on your Samsung Galaxy A40. We installed TWRP. Don’t turn on your mobile. Immediately, move to Magisk Installation steps. Press the Volume Down+Power button to exit Download mode and quickly press Volume Up+ Volume Down+ Power Button to boot into Recovery mode.

4.1 Install Multi disabler, TWRP Installer, and Magisk in your Samsung Galaxy A40 using TWRP

Install Zip files in TWRP

  • Now you are in TWRP Recovery Mode.
  • Select Wipe->Advance Wipe->Select Cache Data. You can also take complete backup using TWRP. It will help you when something goes wrong.
  • Return to Home of TWRP select Install.
  • Select Multi
  • Return to Home of TWRP select Install.
  • Select TWRP
  • The same way, install
  • You should Install One by One. Don’t add more zips feature in TWRP. After the Installation Reboot Your Mobile.
  • You can also install Magisk.apk in your Mobile Applications. Multi disabler avoids the Encryption issue after rooting. You can check your root status using Root Checker.
  • If you didn’t find Magisk in App Drawer, you should Install the Magisk app again.

What More?

In my opinion, you don’t need to root your Samsung Galaxy A40 Android 10 version. If you thought you could Improve Performance By Root; With the Exynos 7904 Octa-Core processor and 4 GB RAM, your device can perform well. If you don’t know how much RAM you need, You will never use this much RAM. It would be best if you did not Boot into Normal OS Booting by pressing the power button after firmware flash. It will boot you to a Non-Rooted environment. So, you should pay attention to the first recovery boot step.

If you root your device, because of the battery drain issues, you can optimize your battery without root. Beyond this, if your purpose is to Disable Bloatware apps, you can do that without using this method. This method uses TWRP custom recovery. Thus you can install Custom ROMs. When you have any suggestions or doubts, comment below.

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4 thoughts on “Root Samsung Galaxy A40 SM-A405FN/FM/S Android 10 using TWRP and Magisk

  1. Buenos días, no puedo rootear mi samsung sm-A405fn con android 10 y parche de seguridad 1 de diciembre de 2020, tengo que borrar el contador de la garantía. Me lo tengo que llevar al samsung porque tienen que reparar el puerto de carga que esta roto, alguien me puede explicar como instalar la version recorveri para este modelo twrp gracias y buenos dias

    • Si tiene un problema de hardware, comuníquese con un centro de servicio cercano. Si tiene problemas de software, puede actualizar el firmware de stock usando ODIN.

  2. Hi
    I rooted my device SM-A405FN Android 10 dual sim following the post of topjohnwu on GitHub (System-as-root method). As my device does not have a boot ramdisk, Magisk is in Recovery. All went well.
    So I started installed some stuff and remove others. But I just discovered that the internal memory shrunk from 64 to 16 Go. According to topjohnwu ‘s page, I did something wrong. I searched a bit, and apparently, TWRP may be used to fix that. I do not have TWRP installed yet (and I did not plan to do so). I would like to know how to install TWRP without full wipe, and if so, the procedure step by step. Many thanks for any answer.

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