Rooting Guide for Samsung S21 Ultra 5G – Step-by-Step

Learn how to root your Samsung Galaxy S21 Ultra 5G with our detailed 2025 guide. Unlock full control with Magisk, TWRP, and DigitalNerds.

Samsung Galaxy S21 Ultra 5G

How to Root Samsung S21 Ultra 5G

This guide provides step-by-step instructions to root your Samsung Galaxy S21 Ultra 5G using Magisk, Odin, and TWRP. Unlock custom ROMs, rooted apps, and more with DigitalNerds.

1. Prerequisites for Rooting Samsung Galaxy S21 Ultra 5G

A Windows PC
A USB cable
At least 60% battery
Samsung USB Drivers installed (Download)
Odin Flash Tool (Download)
Magisk APK (Download)
TWRP Recovery for Samsung Galaxy S21 Ultra 5G (Download)
Firmware for Samsung Galaxy S21 Ultra 5G (Download)

2. Enable Developer Options, OEM Unlock, and USB Debugging

Go to Settings > About phone > Software information
Tap "Build number" 7 times until you see "You are now a developer!"
Go to Settings > Developer options
Enable "OEM unlocking"
Enable "USB debugging"

3. Unlock the Bootloader on Samsung Galaxy S21 Ultra 5G

⚠️ This will wipe your data. Backup everything important.

Turn OFF your phone.
Press and hold VOLUME UP + VOLUME DOWN together.
While holding both buttons, connect your phone to PC via USB.
You will see a WARNING screen.
Press Volume UP to enter Bootloader Unlock mode.
Press and hold Volume UP again to confirm.
Device will reset and reboot.

After reboot, re-enable USB debugging and OEM unlocking if needed.

4. Download and Extract Firmware for Samsung Galaxy S21 Ultra 5G

Download the latest firmware for Samsung Galaxy S21 Ultra 5G: Download
Extract the zip file. You will get:
- AP_xxx.tar.md5
- BL_xxx.tar.md5
- CP_xxx.tar.md5
- CSC_xxx.tar.md5 or HOME_CSC_xxx.tar.md5

5. Patch AP File with Magisk for Samsung S21 Ultra 5G

Install Magisk APK on your phone.
Open Magisk > Install > Select and Patch a File
Select the AP_xxx.tar.md5 file from the extracted firmware.
Magisk will generate a patched file: magisk_patched.tar
Transfer this file to your PC.

6. Flash Patched Firmware via Odin

Reboot device to Download Mode again (same as bootloader unlock steps).
Open Odin on PC.
In Odin:
- AP: magisk_patched.tar
- BL: BL_xxx.tar.md5
- CP: CP_xxx.tar.md5
- CSC: HOME_CSC_xxx.tar.md5 (use CSC_xxx.tar.md5 only if you want to wipe data)
Uncheck "Auto Reboot" in Odin options.
Click "Start" to flash.

7. Boot into Recovery and Reboot to System

After flashing, boot into TWRP recovery manually:
- Press and hold Power + Volume Up while phone is off.
In TWRP:
- (Optional) Wipe data if needed.
- Reboot to system.

8. Verify Root Access for Samsung Galaxy S21 Ultra 5G

Open Magisk app.
It should show "Installed" and "Rooted".

Alternate Option for Rooting Samsung S21 Ultra 5G

If you're unsure about flashing manually, try a trusted service where professionals handle rooting your Samsung Galaxy S21 Ultra 5G remotely. Ideal for avoiding risks with tools like Magisk or TWRP.

🌐 Try it here: https://oneclickroot.com/root-now/

Alternatively, find pre-patched root files for Samsung Galaxy S21 Ultra 5G on:
👉 XDA Forums

(Note: Verify compatibility with your Samsung Galaxy S21 Ultra 5G firmware version.)

FAQs About Rooting Samsung Galaxy S21 Ultra 5G

What is rooting Samsung Galaxy S21 Ultra 5G?

Rooting your Samsung Galaxy S21 Ultra 5G grants superuser access, allowing you to install custom ROMs, use rooted apps, and customize your device with tools like Magisk or TWRP.

Is rooting Samsung S21 Ultra 5G safe?

Rooting Samsung S21 Ultra 5G is safe if you follow our guide carefully. Backup data, use verified tools like Magisk, and avoid unofficial firmware to prevent issues.

Can I unroot Samsung Galaxy S21 Ultra 5G?

Yes, you can unroot Samsung Galaxy S21 Ultra 5G by flashing stock firmware via Odin. Visit DigitalNerds for an unrooting guide.

Troubleshooting Rooting Issues for Samsung Galaxy S21 Ultra 5G

Fix Samsung Galaxy S21 Ultra 5G Bootloop After Rooting

If your Samsung S21 Ultra 5G is stuck in a bootloop, boot into TWRP recovery and wipe cache/data. Reflash the Magisk-patched firmware using Odin.

Magisk Not Installed on Samsung S21 Ultra 5G

Ensure you’ve flashed the correct magisk_patched.tar file in Odin. Check compatibility with your Samsung Galaxy S21 Ultra 5G firmware version.

You’re All Set!

You've successfully rooted your Samsung Galaxy S21 Ultra 5G! Enjoy custom ROMs, rooted apps, and full control with DigitalNerds.

⚠️ Rooting your device may void the warranty and can potentially brick your phone if not done correctly. Proceed only if you understand the risks.

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View Samsung Galaxy S21 Ultra 5G Specifications