When we have limited hardware resources, We should restrict unwanted apps from consuming those resources in the background. Samsung Galaxy A21s is a mid-range mobile with 2-6 GB of RAM and an Exynos 850 processor. It can handle daily apps without issues. With the latest Android 11 version, The hardware is optimized further. But when you are a regular Root apps user or Developer, you can root your Samsung Galaxy A21s Android 11 using the below method. Since we are not using custom recovery like TWRP in this process, You can’t install custom ROMs. But you can use all Root apps and Mods.
Compared with standard other root methods, this method has additional steps. So, You should care a little bit when you do the process. 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. If you are a regular user, you can try some alternatives for your purpose that don’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 A21s Android 11 version?
It would be best if you had a strong reason for rooting. Samsung Galaxy A21s already comes with Android 10 and is already optimized. You have More than Enough 2-6 GB RAM to use daily apps without lag for years. Yes, I Know; RAM maybe looks 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. But beyond this not go reasons you are addicted to some root apps, or you are a frequent user of some Custom OS, you can proceed further. But if you want to root because everybody is doing it, I advise you, don’t root If you don’t have any experience. For regular users, It can become a Nightmare.
How to Root Samsung Galaxy A21s Android 11 One UI 3
Thanks to the developer- cldkrs for the Root method and topjohnwu – this genius is the one who discovered and maintained Magisk. Samsung Galaxy A21s International variants come with a flexible bootloader. It means that We can easily root the smartphone. The device can also install TWRP recovery or any other custom recovery file/app. Don’t try with Snapdragon US Variants like Verizon devices. They come with a locked Bootloader.
This article explained the easiest method to follow and install Magisk on Samsung Galaxy A21s. But In the below process, we will Root this device by using Magisk. You can install Official TWRP using the official app when it is released. TWRP recovery is a custom recovery file installed on your devices because you can root them successfully. 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 A21s. Before sharing the tutorial, you may want to know that you can easily install any root apps with the Magisk present on your device. Does it seem complicated? Relax; We will explain everything briefly in bullets.
Things to check out for;
Check your device model number.
- You should back up 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 A21s.
- Switch off your device. Enter into Download Mode-> Volume Down + Volume Up+ Power Button and Connect your mobile with your PC using a USB Cable. When the Download mode warning screen Appears, Press the Volume Up button to unlock the 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. Preparing Patched Boot Image file
Download and install the Samsung USB driver to your computer system.
Install ODIN on your PC. Select the above Oreo version in the ODIN list. Also, download the ODIN software.
- Download Samsung Galaxy A21s Android 11 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.
- Download 7Zip-ZS and 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 boot.img.lz4.
- Copy the boot.img.lz4 and Vbmeta.img.lz4 to LZ4 Installed folder. Convert the lz4 file to a .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 conversion, Copy the boot — img file to your mobile. Leave Vbmeta in the PC folder.
- Download Modified Magisk Manager or Magisk canary and Installed 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 Boot Image File and patch the file.
- Wait for the process to complete; in the end, you will get a magisk patched .tar file. The .tar file will be in the same folder where you have the Stock firmware file. If you didn’t get the .tar and you got the .img file. No problem. Copy this file to your PC. We can convert the data there.
- When you get the .img file, Open the installed 7zip app. Navigate the magisk patched img file, select Add, Choose .tar format and choose ok. In the .tar, you can find a boot. img. Now we got ODIN flashable boot.tar file.
3. Flash Patched Boot.tar using ODIN
- Copy boot.tar and Vbmeta. img files to your PC. We have already left the Vbmeta. img file on PC. Drag the file into the boot.tar file. Now you can see there are two files within the boot.tar file. Don’t extract the data. The two files contain a single .tar file that should be flashed using ODIN.
- Unlock your screen lock. There should be no fingerprint, PIN Lock, or Wipe. Set No lock in the settings.
- Switch off your Mobile. Enter into Download mode->Volume Down+ Power Buttons and Connect Your Mobile To PC via USB Cable; after Samsung Logo Appear, Release all keys.
- After entering into Download Mode, it will say Warning; press the Volume Up button to continue.
- Launch Odin Application.
- It Will Show the message added.
- If you did not get this message, Repeat the above steps.
- After Getting Added Message Select, AP/PDA Button, then Browse for the patched boot.tar file and select it. Un-Tick the Auto-Reboot. We have to flash only the magisk patched boot image file.
- Press Start and wait for the tasks to complete. After the process is complete, Press the Volume Down+ Power button to exit Download mode. When the screen goes off, Immediately Press Volume Up+ Volume Down + Power buttons to boot into Recovery mode.
- After entering into Stock recovery mode, Go to Wipe Data/Factory Reset and Select Yes to wipe data. It will erase your saved data on your device. Don’t Boot into OS. Read below Boot stages before booting.
Boot into Rooted OS
- Press and Hold Volume Up + Power buttons, and release all the keys once the Bootloader warning appears. You have to set up your device like a new device. You can select the root status using the Root Checker.
- Stock Recovery Boot – Press and Hold Volume Up + Power buttons and release keys while holding the Volume Up key.
- You will see Magisk Manager in your App drawer. If you can’t find the app, you can install Magisk Manager on your mobile.
In my opinion, you don’t need to root your Samsung Galaxy A21s Android 11 version. If you thought you could Improve Performance By root, your device could perform well with the Exynos 850 Octa-Core processor and 2-6 GB RAM. If you don’t know how much RAM you need, You will never use this much RAM. It would help 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.
When you accidentally urge and boot frequently, Don’t panic; after setup everything, switch off your device and boot into Rooted OS using the keys mentioned above. 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. If you have any suggestions or doubts, comment below.
Selva Kumar is an Android Devices Enthusiast, Who Can Talk and Write About Anything If You Give a Hint About the respective devices. He is a Computer Science Graduate, Making His Career towards this Technology. He is always eager to try new Android devices — not only Software level but Hardware-level Also. Beyond this, He is a Good Swimmer, Guitarist.