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.

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.

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.

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

• 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.

• 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.

• 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.

• Download Samsung A40 Android 10 Kernel.zip, Extract it and copy it to your PC. Also, Download Samsung Galaxy A40 TWRP.tar and rename the file to recovery.tar, copy it on your PC.

• Download Multi disabler.zip, twrp-installer-3.4.0-0-a40.zip, and Magisk.zip files (Don’t download .apk file) copy it on your Pendrive With OTG Cable. You can refer to the uses of OTG. (Or, you can prefer an external SD Card)

• Download Samsung Galaxy A40 Android 10 Firmware and save it on your PC. Your Current OS version and Downloaded Version AP and CSC should be the Same.

• You can use Phone Info to know your firmware version.

3. Preparing Patched Vbmeta Image file

• 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.

• 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.

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

• 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.

• 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

• 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!!!

• 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.

• Click on “Start”

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

• 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

• 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 disabler.zip.

• Return to Home of TWRP select Install.

• Select TWRP Installer.zip.

• The same way, install Magisk.zip.

• You should Install One by One. Don’t add more zips feature in TWRP. After the Installation Reboot Your Mobile.

Selva Ganesh

Selva Ganesh is the Chief Editor of this Blog. He is a Computer Science Engineer, An experienced Android Developer, Professional Blogger with 8+ years in the field. He completed courses about Google News Initiative. He runs Android Infotech which offers Problem Solving Articles around the globe.