Samsung Galaxy S21 Ultra is a huge, powerful Android phone with some big upgrades over the Galaxy S20 Ultra. The device comes with a 6.8-inch Dynamic AMOLED 2X display, Contour Cut Camera, and Corning Gorilla Glass Victus. It is powered by Qualcomm Snapdragon 888 or Exynos 2100 (Global).

On this page, we will guide you on how to root the Samsung Galaxy S21 Ultra 5G without the TWRP Recovery. To flash the rooting file, you need to first unlock the bootloader on your device.

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We will use the Magisk by patching the Stock ROM boot image file and flashing it to the device boot partition. The Galaxy S21 Ultra 5G device comes with variants SM-G998B/U. Just follow the full article with all the requirements, download links, and flashing steps with images.

In order to root, you will require to download the patched image file from Magisk Manager and flash it. It’s worth mentioning that your Galaxy S21 Ultra 5G device bootloader should be unlocked at first. Without the bootloader unlocking, it’s not possible to enable root access on your phone. By rooting your handset, you will get a superuser or administrator control on your system over system apps and subsystems.

Samsung Galaxy S21 Ultra 5G Device Overview

The Samsung Galaxy S21 Ultra features a 6.8-inch Dynamic AMOLED panel with a refresh rate of 120Hz. It has a resolution of 1440 x 3200 pixels and an aspect ratio of 20:9. The brightness is also quite high, with maximum peak brightness reaching up to 1500 nits, making outdoor visibility no issue at all. As for the protection, we have the industry best Gorilla Glass Victus protection in the S21+, and we also have the HDR10+ certification for HDR video playback.

Install Modified Custom ROM on Samsung Galaxy S21 Ultra

For processing power, we get the Qualcomm Snapdragon 888 for the Chinese and American market, while the rest of the world gets the Exynos 2100 chipset. Both these processors are built on a 5nm manufacturing process. The Snapdragon 888 is an octa-core processor consisting of one Kryo 680 core clocked at 2.84 GHz, 3 Kryo 680 cores clocked at 2.42 GHz, and four Kryo 680 cores clocked at 1.8 GHz. The Exynos 2100 is also an octa-core processor with one Cortex-X1 core clocked at 2.9 GHz, three Cortex-A78 cores clocked at 2.8 GHz, and four Cortex-A55 cores clocked at 2.2 GHz.

In terms of optics, we have a quad-camera setup at the rear and a single high megapixel camera at the front. The quad-camera setup consists of a 108MP primary sensor paired with an f/1.8 lens, a 10MP periscopic telephoto lens paired with an f/4.9 lens, a 10MP telephoto sensor paired with an f/2.4 lens, and a 12MP ultrawide sensor paired with an f/2.2 lens. The rear setup is capable of capturing 8K videos at 24 fps. We also have stereo sound recording and HDR10+ video recording. Coming to the front, we have a 40MP lens paired with an f/2.2 lens. This is capable of capturing 4K videos at 60 fps.

The smartphone is available in three storage options: 12GB of RAM with 128GB of internal storage, 12GB of RAM with 256GB of internal storage, and 16GB of RAM with 512GB of internal storage. The top option is definitely an overkill for a smartphone. The phone comes with Android 11 out of the box, with OneUI 3.1 running on top. In terms of connectivity, we have Wi-Fi 802.11 a/b/g/n/ac/6, Bluetooth 5.2, GPS, NFC, and USB Type-C 3.2.

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For sensors, we get the under-display ultrasonic fingerprint sensor, accelerometer, gyro, proximity, compass, and barometer. Again, we get the Samsung exclusive Samsung DeX, Samsung Wireless DeX, Bixby natural language command and dictation, and Samsung Pay with the S21 Ultra, too, just like the S21+. The smartphone is available in five color options: Phantom Black, Phantom Silver, Phantom Titanium, Phantom Navy, and Phantom Brown. The base variant of the Samsung Galaxy S21 Ultra starts from 105,999 INR or 1,178.95 USD.

Definition of Root

Smartphone Rooting is just like jailbreaking the device to get the admin access over subsystem, system apps, the root directory of the device, and more. It will give you the superuser control to use your device over an Android subsystem. After rooting a device, the user can delete, edit, or change the system files or settings easily. The rooted users can also increase or decrease the system performance, battery performance, etc.

Mostly, the rooting process will come in handy if you’re using any third-party Custom ROMs. This will increase the accessibility up to a broader extent. Though sometimes improper rooting may brick your device or void your device warranty as well (if applicable). Most commonly, people use rooting to change themes, icons, fonts, install other mod files, tweaking Android settings for visual changes, etc.

Additionally, a rooted device user can also tweak notification panel, system user interface, accent color changes, install Xposed modules, lock screen changes, widgets, camera improvements, and more.

Advantages of Rooting

  • You can get access to all files on your Galaxy S21 Ultra 5G, even the files present in the root directory of your phone.
  • You can increase the performance of your device by overclocking.
  • By rooting you can increase battery life by underclocking the device.
  • Install the Xposed Framework and Xposed module support.
  • Uninstall Bloatware on Galaxy S21 Ultra 5G.
  • You can block Ads on any applications like YouTube, Browser.
  • By Rooting your device, you can View, Edit, or Delete any system file inside the root directory.

Steps To Root Galaxy S21 Ultra 5G using Magisk

Before starting the rooting process, make sure to unlock the device bootloader at first. Then you can continue with the next steps.

  • Samsung Galaxy S21 Ultra 5G Firmware Flash File
  • How to Unlock Bootloader on Samsung Galaxy S21 Ultra 5G
  • Samsung Galaxy Android 12 Update Tracker | One UI 4.0 Release Date

After you have downloaded the exact firmware file based on your device model number, you can extract the boot.img file to patch it via Magisk manager app.

Please Note:

  • Rooting will block the official OTA updates

  • After Rooting, it may void the warranty of your phone

  • You need to unlock the bootloader on your device.

  • Supported model:

  • Galaxy S21 Ultra 5G: SM-G998U / SM-G998B

  • Galaxy S21 Ultra 5G: SM-G998U / SM-G998B

Download Firmware

  • Galaxy S21 Ultra 5G Firmware:

  • SM-G998U: Download Here

  • SM-G998B: Download Here

  • SM-G998U: Download Here

  • SM-G998B: Download Here

Steps to Create a Patched boot image using Magisk Manager

  • First, download and install the latest Magisk Manager app.

  • Next, connect your device to the PC via the USB cable.

  • Copy only the boot.img file from the extracted folder to your device storage.

  • Now, open the Magisk Manager app and select INSTALL and choose to install again.

  • Then tap on “Patch Boot Image File”.

  • Go to internal storage and select your device boot image that you moved earlier.

  • Now, wait for Magisk to start patching the boot image.

  • Once the boot image has been patched, copy the “patched_boot.img” from the internal storage and replace it in the same extracted ROM folder on your PC.

Now, follow the second step to flash the patched boot image file.

  • Odin flash tool accepts files in .tar format. So, you have to use 7zip and archive it to .tar format. You can even rename the file as boot.img.tar as shown in the below screenshot.

Steps To Install the Patched Boot Image tar file on Galaxy S21 Ultra 5G

Now, follow the final or second method to install the patched boot image file on your Galaxy handset. But first, follow the requirements.

Pre-Requirements:

  • ROM Supported for – Samsung Galaxy S21 Ultra 5G model only. Don’t try it on other devices.
  • Keep your device battery charged up to 60% at least before doing anything.
  • Take a full backup without the root of the device’s internal storage.
  • A Windows PC or Laptop and a USB cable are required.
  • Download the Latest ODIN tool and install it on your computer.
  • Download and Install the latest Samsung USB Drivers on your computer.
  • Copy the patched boot image file into the ADB & Fastboot directory.

Instructions to Root Galaxy S21 Ultra 5G Using Magisk

After following the pre-requirements and unlocking the bootloader, in order to Root Galaxy S21 Ultra 5G Using Magisk, let’s take a look at the rooting steps.

  • First, reboot your device into download mode.

  • Now, connect your phone to the PC via a USB cable.

  • Once you are connected, now open the downloaded ODIN.exe file.

  • When you connect the USB cable you will see a blue sign in Odin.

  • Now, load the patched boot.tar file in the AP section.

  • Go to Option and see whether the Auto Reboot and F-Reset Time selected or not). If not then select these two. Don’t select re-partition.

  • Now, tap on the Start button to root your device.

  • Your device will reboot when the process will complete.

  • Then wait for a few minutes. The first boot will take some time.

  • You’re done. Enjoy!

We assume this guide is really helpful to you and you have successfully rooted your Samsung Galaxy S21 Ultra 5G device by using Magisk. In case of any issue, do let us know via email at getdroidtips@gmail.com.