Last Updated: June 3, 2026
Installing the official Samsung Galaxy S21 Ultra 5G SM-G9980 firmware is the most reliable way to fix software issues on this specific model. This page provides the exact flash files, hard reset steps, FRP bypass methods, drivers, and tools required for a successful repair.
Device: Samsung Galaxy S21 Ultra 5G SM-G9980 | Chipset: Qualcomm SM8350 Snapdragon 888 5G | Flash Tool: Odin
Android: Android 11, One UI 3.1 (upgradable to Android 15, One UI 7) | File Type: .tar.md5 / ZIP (Contains AP, BL, CP, CSC files for Odin)
⚠ Warning: Flashing erases all data. Back up first.
Samsung Galaxy S21 Ultra 5G SM-G9980 Firmware (Flash File) Drivers, Tools & Guide
Installing stock software on this device requires Odin, the correct Samsung Galaxy S21 Ultra 5G SM-G9980 firmware files, and a proper USB connection. Using Odin to flash Samsung phones is a straightforward process if you have the correct files ready. This guide includes the right firmware package, the necessary Odin version, and the exact steps to get the job done.
Before starting the installation, sign out of any active Samsung accounts on the device. Skipping this step will trigger Knox security, leaving you with a KG lock that takes much longer to resolve. Also, ensure your downloaded package contains the standard .tar.md5 files labeled AP, BL, CP, and CSC (or HOME_CSC). If those files are missing, you have the wrong archive.
The Samsung Galaxy S21 Ultra 5G SM-G9980 firmware downloads as a ZIP archive. You will need to extract it using WinRAR or 7-Zip. Once extracted, verify that you see the AP_*.tar.md5, BL_*.tar.md5, CP_*.tar.md5, and CSC_*.tar.md5 (or HOME_CSC_*.tar.md5) files. Missing these files means the package is incorrect for your phone.
Remember that a full firmware installation will wipe all data on the phone. This factory reset effect is exactly what resolves persistent software bugs, FRP locks, system lag, forgotten passwords, bootloops, connectivity bugs, and battery drain.
Hard Reset Samsung Galaxy S21 Ultra 5G SM-G9980
You can factory reset the Samsung Galaxy S21 Ultra 5G SM-G9980 without a computer by holding the Volume Up + Power buttons together until the recovery menu loads. Turn the device completely off. Press and hold Volume Up + Power (or Volume Up + Home + Power on older models with a physical home button) until you see the Android recovery screen. Use the volume rocker to highlight “Wipe Data/Factory Reset” and press the Power button to select it.
Performing this reset clears all user data and returns the Samsung Galaxy S21 Ultra 5G SM-G9980 to its factory state. It clears up standard performance drops, system crashes, and forgotten lock screen patterns. If the phone remains stuck in a bootloop after the reset, proceed to the full Odin flash instructions below.
Samsung Galaxy S21 Ultra 5G SM-G9980 FRP Bypass
The most effective method to bypass FRP on the Samsung Galaxy S21 Ultra 5G SM-G9980 involves using a free Android apps launcher to access device settings during the initial setup. A factory reset or firmware flash often leaves a Google account lock active. You can use our free Android apps launcher to reach the necessary settings and bypass this lock. Removing your Google account before starting any software repairs is always the best practice to prevent this situation entirely.
Why Do We Need Samsung Galaxy S21 Ultra 5G SM-G9980 Firmware?
Flashing the official Samsung Galaxy S21 Ultra 5G SM-G9980 firmware is necessary to repair severe software corruption, update the operating system, or remove persistent locks. Odin is the standard tool for flashing Samsung phones, regardless of the processor inside. Installing the official software resolves a wide range of operational issues:
- Remove pattern locks or disabled device states.
- Upgrade the phone to the newest supported Android version.
- Clear freezing, lagging, and continuous bootloops on your SM-G9980.
- Fix battery drain and failed over-the-air (OTA) update installations.
- Reinstall the original stock ROM to maintain warranty status.
- Repair a phone that only boots into the recovery environment.
- Clear KG lock or Knox errors resulting from an interrupted or incorrect software installation.
Learn more about stock ROMs and why flashing works.
Choosing the Right Firmware Version
Selecting the correct firmware version requires matching your exact model number, region code, and binary level. Confirming your file details is critical before opening Odin. Installing the wrong package causes major complications:
- Identify Your Exact Model Number: Open Settings › About Phone and check the full model number (e.g. SM-G9980). The suffix letter dictates the region, U/U1 for USA, W for Canada, N for Korea, and B/F for international markets. Cross-flashing regional variants causes hardware conflicts.
- Match the CSC (Region): The firmware filename includes a 3-letter region code that must match your phone. You can find your current CSC under Settings › About Phone › Software Information or on the Service Provider line in Download Mode. Standard codes include XAA (US), BTU (UK), INS (India), and SER (Russia).
- Check the Binary Level: Look at the letters and numbers in your current software version (e.g.
XXU9BZDP). The number directly after the letters is the binary level. Samsung devices cannot be downgraded past their current binary. A phone on Binary 9 requires Binary 9 or higher. - Confirm the Build Date: The final 4 characters of the PDA string indicate the build date. The first letter is the year (A=2024, B=2025, C=2026) and the second is the month (A=Jan through L=Dec).
- Verify in Download Mode: Power off the phone and hold Volume Down + Power to access Download Mode. This screen lists your exact model, CSC, and current software build for easy verification.
Firmware Details for Samsung Galaxy S21 Ultra 5G SM-G9980
The official Samsung Galaxy S21 Ultra 5G SM-G9980 firmware runs on the Qualcomm SM8350 Snapdragon 888 5G chipset and comes packaged in standard Odin-compatible formats. Here is a quick overview of the official firmware specifications:
| Firmware Information | Details |
|---|---|
| Device Model | Samsung Galaxy S21 Ultra 5G SM-G9980 |
| Firmware Version | N/A |
| File Size | N/A |
| Android Version | Android 11, One UI 3.1 (upgradable to Android 15, One UI 7) |
| Platform | Qualcomm SM8350 Snapdragon 888 5G |
| Release Date | Released 2021, January 29 |
| Region | Global, Africa and Asia |
| File Type | .tar.md5 / ZIP (Contains AP, BL, CP, CSC files for Odin) |
Which Firmware Version Should I Download?
You should download the firmware version that matches your current binary level and specific regional CSC code. Picking the right file is a common question. Use the table below to match your specific situation with the correct download:
| Your Situation | What I Recommend |
|---|---|
| Phone is completely dead or stuck on logo | the latest version, download this one. It is the latest Samsung Galaxy S21 Ultra 5G SM-G9980 firmware available. |
| FRP / Google account lock only | See the FRP bypass guide above, you likely do not need the full firmware for this. |
| Not sure which region/CSC to download | Check Settings › About Phone › Software Information for your current CSC, or enter Download Mode (Volume Down + Power), it shows the CSC on screen. Match the 3-letter code (e.g. XAA, BTU, INS) to the firmware filename. |
| Phone slow after a recent OTA update | Try the next older version, sometimes the latest OTA introduces new bugs and an older build runs better. Make sure the binary level is the same or higher than what your device currently has. |
| IMEI missing after a previous flash | Re-flash the latest version first, then follow the IMEI repair guide. Do not skip the reflash. |
| the latest version failed with a flash error | Try the next older version instead and double-check your AP/BL/CP/CSC file assignments in Odin before assuming the firmware is the problem. |
| Restoring to factory / warranty repair | the latest version, clean state, fresh start. |
To tell which Samsung firmware is newer, look at the last 4 characters of the PDA version string (e.g. S938BXXU9CZDP). The first character is the year (A=2024, B=2025, C=2026), the second is the month (A=Jan, B=Feb… L=Dec, Z=final stable), and the last two are the revision (0-9 then A-Z, where Z is highest). But before comparing dates, always check the binary level: the digit just before the date code (e.g. XXU9CZDP = Binary 9). You cannot downgrade to a lower binary level. If your device is on Binary 9, only flash Binary 9 or higher. Also make sure the 3-letter CSC code in the firmware matches your device region.
Download Samsung Galaxy S21 Ultra 5G SM-G9980 Firmware
You can download the official Samsung Galaxy S21 Ultra 5G SM-G9980 firmware directly from the links provided below. The latest available version is the latest version. Once the download finishes, compare the file size against the specifications table. A mismatch in file size usually points to a corrupted download, and flashing broken files creates more software issues.
Only download firmware that is fully compatible with your exact device model. See the firmware selection guide above if you are not sure.
- Your model number is a variant of SM-G9980 with a different letter suffix. Check About Phone carefully, one letter difference can cause a failed or broken flash.
- Your chipset differs from Qualcomm SM8350 Snapdragon 888 5G. Confirm in recovery mode before proceeding.
- You downloaded the file from a source other than this page.
- The file size differs significantly from the sizes listed in the table above, a size mismatch usually means a partial download, which will fail mid-flash.
Prerequisites for Samsung Galaxy S21 Ultra 5G SM-G9980 Firmware
Preparing to flash the Samsung Galaxy S21 Ultra 5G SM-G9980 firmware requires backing up your data, removing all accounts, and installing the correct USB drivers. Check these items off your list before launching Odin. The two most frequent issues I see are Samsung accounts left signed in (which causes KG lock) and low-quality charging cables dropping the connection. Always use a high-quality data cable for this process.
- Back Up IMEI Numbers: Dial *#06# and write down both IMEI numbers now. You will need these if you need to restore your IMEI after flashing.
- Remove Google Accounts: Sign out of all Google accounts to prevent FRP lock after flashing.
- Remove Samsung Accounts: Sign out of all Samsung accounts to avoid KG lock.
- Back Up Your Data: Back up everything, photos, contacts, WhatsApp chats, important files. Flashing wipes the device completely.
- Charge Your Device: At least 50% battery. A device that powers off during a flash is very difficult to recover.
- USB Cable & PC: Use a proper data USB cable, not a charge-only cable, and a Windows computer with available USB ports.
- Install Required Drivers:
How to Install Firmware on Samsung Galaxy S21 Ultra 5G SM-G9980
You can install the Samsung Galaxy S21 Ultra 5G SM-G9980 firmware by loading the extracted AP, BL, CP, and CSC files into Odin and clicking start. We are using Odin for this procedure. Keep the “Auto Reboot” and “F. Reset Time” boxes checked in Odin to ensure a clean installation. If you need help choosing an Odin version, check our Odin versions page. Older Samsung hardware sometimes operates better with previous Odin builds.
- Download and Extract:
- Download the correct firmware package from the links above.
- Extract the ZIP to a simple folder path, avoid paths with spaces or special characters, as some flash tools have trouble with them.
- Install the Listed Drivers:
- Confirm all drivers listed above are installed and that your PC has been restarted since installation. Skipping the restart is a common reason drivers do not work correctly.
- Load the Firmware File:
- In Odin, click “BL” and select the BL_*.tar.md5 file. Click “AP” and select the AP_*.tar.md5 file. Repeat for “CP” and “CSC”. Use HOME_CSC to keep data, or CSC for a clean flash.
- Connect Your Device:
- Enter Download Mode: Turn off your phone, then hold Volume Down + Power (add Home button on older models) until the warning screen appears. Press Volume Up to confirm and enter Download Mode.
- Connect your phone to your PC via USB. Odin should show “Added..” in the log area, this means your device is detected.
- Start Flashing:
- Click the “Start” button to begin.
- Do not disconnect, move the cable, or touch the device until the process is fully complete. Disconnecting mid-flash is how devices get bricked.
- Wait and Reboot:
- Once flashing finishes successfully, disconnect the device.
- Power on your device. The first boot will take longer than usual, give it up to 8 minutes.
Video Guide for Flashing
What to Expect After Flashing Samsung Galaxy S21 Ultra 5G SM-G9980 Firmware
After applying the Samsung Galaxy S21 Ultra 5G SM-G9980 firmware, the first boot will take up to 8 minutes and the device will be completely wiped of personal data. Many users assume the installation failed when the phone takes a long time to restart. Here is what is entirely normal after a successful flash:
- How to know the flash was successful: The Odin interface will display “PASS.” in a green box. Seeing this message confirms the installation completed properly.
- First boot takes 3 to 8 minutes, the system is rebuilding its core files. Leave the phone alone during this time to prevent bootloop errors.
- The phone will feel warm during first boot, the processor is working hard to initialize the operating system. It will cool down shortly.
- All your apps are gone, a clean flash removes everything. You can reinstall your applications from the Play Store or restore them from a previous Google backup.
- Dial *#06# immediately after setup to verify your IMEI status. Do this before inserting a SIM card. If the screen displays “unknown”, refer to the IMEI repair guide below.
- Be careful when re-adding your Google account, entering your credentials during the initial setup wizard prevents FRP triggers.
- Wi-Fi, Bluetooth, and mobile data should connect automatically. If mobile data fails, navigate to Settings › SIM and Network to manually input your carrier APN details.
- Stuck in a bootloop after first boot? Access recovery mode and execute a factory reset, see the hard reset guide above. This clears out conflicting temporary files from the old system.
- Samsung Smart Switch: Once the Samsung Galaxy S21 Ultra 5G SM-G9980 firmware is installed, Smart Switch might download extra security updates. Allow this process to finish to ensure your system is fully patched.
Missing IMEI or Corrupt Baseband on Samsung Galaxy S21 Ultra 5G SM-G9980 After Flashing?
A missing IMEI after flashing usually indicates a corrupted EFS partition that requires dedicated repair tools to restore. The EFS partition holds your IMEI and network configuration. Restoring an IMEI number that does not belong to the original device is illegal in most regions, so only repair the number you wrote down before starting. Software like ChimeraTool or BFT can fix this issue. Verify your local regulations before proceeding.
Video Guide: How to repair IMEI
Common Issues When Flashing Samsung Galaxy S21 Ultra 5G SM-G9980
- Odin Shows “FAIL” Instead of “PASS”:
- This error typically means the software region or model does not match the phone. Double-check your exact model details in Settings › About Phone. A single letter difference in the model code will cause the flash to reject.
- Samsung Galaxy S21 Ultra 5G SM-G9980 Not Recognized by Odin:
- Install the Samsung USB drivers again and ensure the phone is in Download Mode. Replacing the USB cable often fixes detection issues caused by poor connectivity.
- KG Lock / Knox Triggered After Flashing:
- This security measure activates when a Samsung account remains logged in prior to flashing, or when unauthorized software is applied. Signing out of accounts beforehand prevents this. Resolving an active KG lock usually requires a professional service tool.
- Boot Loop After Flashing:
- Boot into recovery mode (Volume Up + Power) and perform a factory reset. This wipes residual data from the previous installation that might be causing system conflicts.
Frequently Asked Questions
Q1: Will flashing the Samsung Galaxy S21 Ultra 5G SM-G9980 firmware erase my data?
A: Yes. Installing this software via Odin completely wipes the phone and restores Android 11, One UI 3.1 (upgradable to Android 15, One UI 7) factory defaults. Every app, photo, contact, and account will be deleted. Save your files beforehand, as data recovery is impossible after the installation finishes.
Q2: Is this firmware compatible with other Samsung models?
A: No. This package is designed exclusively for the Samsung Galaxy S21 Ultra 5G SM-G9980 utilizing the Qualcomm SM8350 Snapdragon 888 5G processor. Even similar variants of SM-G9980 might use different internal hardware. Forcing incompatible software onto your phone can cause severe damage. Always verify your model in Settings › About Phone.
Q3: Can I downgrade from the latest version to an older firmware version?
A: While technically possible on certain Qualcomm processors, rolling back is generally a bad idea. Downgrading introduces security vulnerabilities and app instability on Android 11, One UI 3.1 (upgradable to Android 15, One UI 7). If the newest build is malfunctioning, describe the problem in the comments below for a better solution.
Q4: What should I do if I encounter an FRP lock after flashing?
A: You can use our free Android apps launcher. The FRP prompt appears on the Samsung Galaxy S21 Ultra 5G SM-G9980 when a Google account remains active before a reset. Removing your Google account prior to flashing is the easiest way to prevent this lock.
Q5: Are custom ROM options available for the Samsung Galaxy S21 Ultra 5G SM-G9980?
A: This page focuses entirely on official Samsung stock software. The availability of custom ROMs for the Samsung Galaxy S21 Ultra 5G SM-G9980 depends on the open-source support for the Qualcomm SM8350 Snapdragon 888 5G chipset. Visit our Custom ROMs page or the XDA Developers forum for specific custom development threads.
Q6: My Samsung Galaxy S21 Ultra 5G SM-G9980 is not detected by Odin. What should I do?
A: Driver issues are the usual culprit. Reinstall the Samsung USB drivers, reboot your computer, and try again. Move the cable to a USB 2.0 port instead of USB 3.0, as Samsung phones connect more reliably to the older standard. Temporarily turn off your antivirus software. If Odin still refuses to detect the phone, leave a comment with the specific error code.
Q7: How do I enter recovery mode on my Samsung Galaxy S21 Ultra 5G SM-G9980?
A: Turn the phone off entirely. Press and hold Volume Up + Power simultaneously until the recovery menu loads. On older Samsung hardware featuring a physical Home button, press Volume Up + Home + Power. The recovery screen displays the current build number for your Samsung Galaxy S21 Ultra 5G SM-G9980, allowing you to verify the software version.
Q8: My IMEI shows “unknown” after flashing the Samsung Galaxy S21 Ultra 5G SM-G9980. Is my phone permanently damaged?
A: The phone is not permanently damaged, even though the error looks serious. Follow the IMEI repair guide located in the troubleshooting section. Check the EFS partition for corruption first. Refrain from inserting a SIM card until the original IMEI is fully restored.
Q9: How long does it take to flash Samsung Galaxy S21 Ultra 5G SM-G9980 firmware?
A: The Odin installation process typically requires 3 to 10 minutes, depending on the file size and your USB transfer speed. The initial reboot after the installation takes an additional 3 to 8 minutes. Never unplug the device during either phase. If the Odin progress bar freezes, wait a few extra minutes before troubleshooting.
Final Thoughts on Samsung Galaxy S21 Ultra 5G SM-G9980 Firmware
Following this guide will successfully install the official Samsung Galaxy S21 Ultra 5G SM-G9980 firmware and restore full functionality to your device. These steps cover everything required to safely apply the official Samsung Galaxy S21 Ultra 5G SM-G9980 firmware (the latest version) using Odin. If you followed the instructions carefully, your phone is now running a clean, stable operating system.
If you ran into an error or a specific step failed, leave a detailed comment below. Include the exact error message, the step you are currently on, and the troubleshooting steps you have already attempted. I read the comments and will help you resolve the issue.
Sharing this guide helps others who might be facing the exact same software problems with their phones.
Browse all Samsung firmware downloads for more devices.
Disclaimer: Flashing stock firmware is performed at your own risk. Follow the instructions on this page carefully. I cannot be held responsible for any damage to your device, but I will always try to help if something goes wrong.
