Samsung Galaxy S21 Ultra 5G (SM-G998B) Stock ROM Firmware

Download genuine Galaxy S21 Ultra 5G stock firmware update (G998BXXSJHZC2). This package contains the verified, unmodified factory ROM for model SM-G998B (Region: India (INU)), released directly by Samsung.

Firmware Package Specifications

Device: Galaxy S21 Ultra 5G
Model Code: SM-G998B
Region / CSC: India (INU)
PDA / Build Number: G998BXXSJHZC2
Operating System: Android 15
Security Patch Level: 2026-01-01
Release Date: 2026-03-26
Archive File Size: 9 GB (9,660,966,864 bytes)

Manufacturer Changelog & Security Fixes

Security
The device is protected with improved security.

Odin 4-File Flashing Slots

This firmware package includes all 4 standard factory Odin partitions for safe system recovery and unbricking:

BL (Bootloader): Flashes the bootloader and primary hardware initialization tables.
AP (System Image): Contains the system OS, vendor files, and One UI user interface.
CP (Modem / Phone): Flashes the cellular baseband radio and Wi-Fi modem firmware.
CSC (Carrier Config): Select CSC_* to perform a clean factory wipe, or select HOME_CSC_* to upgrade firmware without losing your photos, apps, or settings.

Quick flashing overview for Galaxy S21 Ultra 5G

Download & Extract: Download the verified G998BXXSJHZC2 package for Galaxy S21 Ultra 5G (SM-G998B) and extract the tar.md5 binaries.
Boot Download Mode: Turn off device. Hold Volume Down + Volume Up simultaneously while connecting the USB-C cable to your PC, then press Volume Up at the turquoise warning screen.
Odin Slot Mapping: Open Odin 3.14.4 as Administrator. Assign BL, AP, CP, and CSC slots (HOME_CSC to preserve personal data, or CSC for a clean factory wipe).
Execute & Reboot: Click Start in Odin. Await the green PASS! confirmation (approx. 4–7 minutes) until your device automatically restarts.

Verified Master Guide ⏱️ 7 min read

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Follow our verified, in-depth tutorial with detailed visual steps, prerequisite checklists, Download Mode instructions, and solutions for common errors.

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Platform Note: These instructions apply to systems running Android 15. Verify compatibility before proceeding.

Compatibility and scope

File type: Firmware
Version: G998BXXSJHZC2
Supported OS: Android 15
System architecture: ARM64-V8A
Download size: 9 GB
Release date: Mar 26, 2026

Samsung Galaxy S21 Ultra 5G (SM-G998B) firmware version G998BXXSJHZC2 (Galaxy S21 Ultra 5G Factory Stock Firmware) supports Android 15 on ARM64-V8A systems.

📜 Galaxy S21 Ultra 5G Firmware Release History & Changelog Archive

Firmware update chronicle, OS version progression, and security patch trajectory for SM-G998B (Region: India (INU)):

68 Verified Builds

💡 Click Changelog details to expand verified release notes (Scroll horizontally on smaller screens →)

Build Number (PDA) & Changelog	Android OS	Release Date	Security Patch	Status
G998BXXSJHZC2 Changelog details (2 notes) Security The device is protected with improved security.	Android 15	Mar 26, 2026	🛡️ Jan 2026	✓ Active
G998BXXSJHZA6 Changelog details (2 notes) Security The device is protected with improved security.	Android 15	Feb 04, 2026	🛡️ Jan 2026	Previous
G998BXXSIHYK1 Changelog details (2 notes) Security The device is protected with improved security.	Android 15	Nov 27, 2025	🛡️ Nov 2025	Previous
G998BXXSGHYH1 Changelog details (2 notes) Security The device is protected with improved security.	Android 15	Aug 28, 2025	🛡️ Aug 2025	Previous
G998BXXSFHYE1 Changelog details (1 notes) The security of your device has been improved.	Android 15	Jun 05, 2025	🛡️ May 2025	Previous
G998BXXUEHYD5 Changelog details (10 notes) One UI 7.0 Upgrade (Android 15) Bold new look Visual enhancements Enjoy a more sophisticated and unique look. One UI 7 introduces a stunning redesign to key components including buttons, menus, notifications and control bars, providing a more consistent visual experience with curves and circles. Beautiful new colors, soft animations, and an innovative blur effect that's unique to One UI make information hierarchy clearer and help you focus on important information. Reimagined Home screen Fresh new app icons will look great on your Home screen with new visual metaphors and color schemes that make it easier to recognize the app you need. Widgets have been completely redesigned with more colorful images and more consistent layouts. Folders on your Home screen can also be made larger so you can instantly access apps without opening the folder first. Simplified Home screen grid Your Home screen now looks even better than before. A new standard grid layout keeps things symmetrical and makes it easier to use One UI widgets in standard sizes. Improved Home screen landscape view Get a more consistent look for your Home screen, even when using your phone horizontally. Widgets now have a similar aspect ratio in landscape view, and text labels appear below icons instead of beside them.	Android 15	May 07, 2025	🛡️ Apr 2025	Previous
G998BXXSEGYA2 Changelog details (1 notes) The security of your device has been improved.	Android 14	Feb 24, 2025	🛡️ Feb 2025	Previous
G998BXXSEGXL2 Changelog details (1 notes) The security of your device has been improved.	Android 14	Jan 21, 2025	🛡️ Jan 2025	Previous
G998BXXSEGXK1 Changelog details (1 notes) The security of your device has been improved.	Android 14	Dec 26, 2024	🛡️ Dec 2024	Previous
G998BXXUEGXJE Changelog details (2 notes) Security The device is protected with improved security.	Android 14	Nov 28, 2024	🛡️ Nov 2024	Previous
G998BXXSDGXI5 Changelog details (1 notes) The security of your device has been improved.	Android 14	Oct 21, 2024	🛡️ Oct 2024	Previous
G998BXXSCGXH7 Changelog details (1 notes) The security of your device has been improved.	Android 14	Sep 17, 2024	🛡️ Sep 2024	Previous
G998BXXUCGXGC Changelog details (4 notes) Stability and reliability Device behavior has been improved. Security The device is protected with improved security.	Android 14	Aug 22, 2024	🛡️ Aug 2024	Previous
G998BXXSCGXF4 Changelog details (1 notes) The security of your device has been improved.	Android 14	Jul 23, 2024	🛡️ Jul 2024	Previous
G998BXXSBGXEC Changelog details (1 notes) The security of your device has been improved.	Android 14	Jun 24, 2024	🛡️ Jun 2024	Previous
G998BXXSBGXDH Changelog details (1 notes) The security of your device has been improved.	Android 14	May 29, 2024	🛡️ May 2024	Previous
G998BXXUAGXDA Changelog details (10 notes) One UI 6.1 Upgrade Circle to Search Instantly search for anything on your screen Circle to Search with Google lets you easily learn more about anything shown on your screen without switching apps. Just touch and hold the Home button or navigation handle, then circle anything on the screen to start a Google search. Create epic images Effortlessly enhance your photos Get special AI recommendations for enhancing your photos and videos. You'll find options for adding star trails, colorizing, and more. Suggestions appear when you tap the i button in Gallery. Copy and paste from one image to another Add a missing element to your picture. Just clip an object from an image in Gallery, then go to the image where you want to paste it and choose Paste from clipboard in the More options menu. More accurate image clipping	Android 14	May 13, 2024	🛡️ Apr 2024	Previous
G998BXXSAFXCM Changelog details (1 notes) The security of your device has been improved.	Android 14	Apr 15, 2024	🛡️ Apr 2024	Previous
G998BXXS9FXBE Changelog details (1 notes) The security of your device has been improved.	Android 14	Mar 21, 2024	🛡️ Mar 2024	Previous
G998BXXS9FXAK Changelog details (1 notes) The security of your device has been improved.	Android 14	Feb 29, 2024	🛡️ Feb 2024	Previous
G998BXXS9FWLA Changelog details (1 notes) The security of your device has been improved.	Android 14	Jan 29, 2024	🛡️ Jan 2024	Previous
G998BXXU9FWL3 Changelog details (10 notes) One UI 6.0 Upgrade Quick panel New button layout The quick panel has a new layout that makes it easier to access the features you use most. Wi-Fi and Bluetooth now have their own dedicated buttons at the top of the screen, while visual features, like Dark mode and Eye comfort shield have been moved to the bottom. Other quick settings buttons appear in a customizable area in the middle. Instantly access the full quick panel By default, a compact quick panel with notifications appears when you swipe down from the top of the screen. Swiping down again hides notifications and shows the expanded quick panel. If you turn on Quick settings instant access, you can view the expanded quick panel by swiping just once from the right side of the top of the screen. Swiping down from the left side shows notifications. Quickly access brightness control The brightness control bar now appears by default in the compact quick panel when you swipe down once from the top of the screen for quicker and easier brightness adjustments. Improved album art display While playing music or videos, album art will cover the entire media controller in the notification panel if the app playing the music or video provides album art.	Android 14	Dec 21, 2023	🛡️ Dec 2023	Previous
G998BXXS9EWJO Changelog details (1 notes) The security of your device has been improved.	Android 13	Nov 11, 2023	🛡️ Nov 2023	Previous
G998BXXS9EWIA Changelog details (1 notes) The security of your device has been improved.	Android 13	Oct 17, 2023	🛡️ Oct 2023	Previous
G998BXXS9EWI1 Changelog details (1 notes) The security of your device has been improved.	Android 13	Sep 27, 2023	🛡️ Sep 2023	Previous
G998BXXU9EWH5 Changelog details (4 notes) Stability and reliability Device behavior has been improved. Security The device is protected with improved security.	Android 13	Sep 06, 2023	🛡️ Aug 2023	Previous
G998BXXS9EWH1 Changelog details (1 notes) The security of your device has been improved.	Android 13	Aug 21, 2023	🛡️ Aug 2023	Previous
G998BXXS9EWF3 Changelog details (1 notes) The security of your device has been improved.	Android 13	Jul 20, 2023	🛡️ Jul 2023	Previous
G998BXXU8EWF1 Changelog details (4 notes) Stability and reliability Device behavior has been improved. Security The device is protected with improved security.	Android 13	Jun 21, 2023	🛡️ Jun 2023	Previous
G998BXXS7EWD3 Changelog details (1 notes) The security of your device has been improved.	Android 13	Jun 02, 2023	🛡️ May 2023	Previous
G998BXXU7EWCH Changelog details (3 notes) The Camera and Gallery functions have been improved. Security The device is protected with improved security.	Android 13	May 04, 2023	🛡️ Apr 2023	Previous
G998BXXS6EWBB Changelog details (1 notes) The security of your device has been improved.	Android 13	Mar 31, 2023	🛡️ Mar 2023	Previous
G998BXXU6EWAF Changelog details (10 notes) One UI 5.1 Update One UI 5.1 takes your phone to the next level with new Gallery features as well as productivity and personalization enhancements. Camera and Gallery Quickly change the color tone for selfies It's easier to change the color tone of your selfies using the Effects button at the top of the screen. Discover Expert RAW Expert RAW lets you take high-quality shots, perfect for those who want to have full control and edit photos later. Expert RAW is now easier to access from the More menu in Camera. More powerful search You can now search your Gallery for more than one person or subject at the same time. You can even search for people without tagging their names just by tapping their faces. Enhanced image remastering	Android 13	Mar 01, 2023	🛡️ Feb 2023	Previous
G998BXXS5DWA4 Changelog details (1 notes) The security of your device has been improved.	Android 13	Feb 09, 2023	🛡️ Jan 2023	Previous
G998BXXU5DVKF Changelog details (1 notes) Overall stability of your device has been improved.	Android 13	Dec 28, 2022	🛡️ Dec 2022	Previous
G998BXXS5DVK1 Changelog details (1 notes) · The security of your device has been improved.	Android 13	Dec 20, 2022	🛡️ Nov 2022	Previous
G998BXXU5DVJC Changelog details (10 notes) One UI 5 Upgrade (Android 13) One UI 5 brings you more powerful personalization and makes it easier to get things done across your Galaxy devices. Visual design New app icons and illustrations Icon symbols are larger for a bolder look that's easier to scan. Subtle background gradients and improved contrast give a fresher, more natural feel. New help illustrations have been created to give a consistent look to all apps. Smoother than ever before New animations and transition effects make switching between screens feel more natural. Animations and other visual feedback appear instantly when you touch the screen, making interactions more intuitive. Scrolling speed has also been enhanced to make scrolling feel smoother throughout One UI. Enhanced blur effects and colors Background blur effects on the quick panel, Home screen, and throughout One UI have been improved with brighter colors for a clearer and more consistent experience. Simplified app color schemes help you avoid distractions and focus on your current task. Customization	Android 13	Nov 10, 2022	🛡️ Oct 2022	Previous
G998BXXS5CVIF Changelog details (1 notes) The security of your device has been improved.	Android 12	Oct 22, 2022	🛡️ Oct 2022	Previous
G998BXXS5CVHI Changelog details (1 notes) The security of your device has been improved.	Android 12	Sep 13, 2022	🛡️ Sep 2022	Previous
G998BXXU5CVH7 Changelog details (1 notes) Overall stability of your device has been improved.	Android 12	Sep 01, 2022	🛡️ Aug 2022	Previous
G998BXXU5CVGB Changelog details (1 notes) Overall stability of your device has been improved.	Android 12	Aug 11, 2022	🛡️ Aug 2022	Previous
G998BXXS5CVFB Changelog details (1 notes) The security of your device has been improved.	Android 12	Jul 08, 2022	🛡️ Jul 2022	Previous
G998BXXU5CVF2 Changelog details (1 notes) Overall stability of your device has been improved.	Android 12	Jun 16, 2022	🛡️ Jun 2022	Previous
G998BXXU5CVDD Changelog details (6 notes) Overall stability of your device has been improved. The security of your device has been improved. Camera The Night portrait feature has been enhanced. The quality of pictures taken with social or camera apps downloaded from the application store has been improved. The 'Auto framing' feature is supported in video mode and some video call apps.	Android 12	May 18, 2022	🛡️ May 2022	Previous
G998BXXU4CVD2 Changelog details (1 notes) Overall stability of functions improved.	Android 12	Apr 22, 2022	🛡️ Apr 2022	Previous
G998BXXU4CVC4 Changelog details (10 notes) One UI 4.1 Update One UI 4.1 brings you the latest features for your Galaxy devices. More intuitive, more fun, more secure, and easier than ever. Check out the changes below. Camera It's easier than ever to capture great photos and videos. More options for portrait videos Capture great portrait videos even when your subject is far away. You can now record portrait videos with the 3x lens on the rear camera in addition to the 1x lens. Zoom in farther in Pro and Pro video modes The telephoto lens is now supported in Pro and Pro video modes so you can capture clearer images and videos of far away things. Get the full director’s view	Android 12	Mar 21, 2022	🛡️ Mar 2022	Previous
G998BXXU4BVB1 Changelog details (1 notes) Overall stability of functions improved.	Android 12	Feb 19, 2022	🛡️ Feb 2022	Previous
G998BXXS4BVA8 Changelog details (1 notes) The security of your device has been improved.	Android 12	Feb 17, 2022	🛡️ Feb 2022	Previous
G998BXXU4BULF Changelog details (1 notes) Overall stability of functions improved.	Android 12	Jan 12, 2022	🛡️ Jan 2022	Previous
G998BXXS3BULC Changelog details (1 notes) The security of your device has been improved.	Android 12	Dec 27, 2021	🛡️ Dec 2021	Previous
G998BXXS3BUL1 Changelog details (1 notes) The security of your device has been improved.	Android 12	Dec 10, 2021	🛡️ Dec 2021	Previous
G998BXXU3BUKG Changelog details (1 notes) Overall stability of functions improved.	Android 12	Nov 30, 2021	🛡️ Nov 2021	Previous
G998BXXU3BUK8 Changelog details (10 notes) One UI 4 Upgrade (Android 12) One UI 4 brings you a wide array of new features and enhancements for your Galaxy devices. More intuitive, more fun, more secure, and easier than ever. Check out the changes below. Color palette Customize your phone with unique colors based on your wallpaper. Your colors will be applied to menus, buttons, backgrounds, and apps throughout your phone. Privacy One UI 4 offers strong privacy protection to make sure your personal information doesn’t fall into the wrong hands. Permission info at a glance See when each app accesses sensitive permissions such as Location, Camera, or Microphone in Permission usage. You can deny permissions for any apps you don’t feel comfortable with. Camera and microphone indicators	Android 12	Nov 18, 2021	🛡️ Nov 2021	Previous
G998BXXS3AUJ7 Changelog details (1 notes) The security of your device has been improved.	Android 11	Oct 28, 2021	🛡️ Nov 2021	Previous
G998BXXU3AUIE Changelog details (1 notes) Overall stability of functions improved.	Android 11	Sep 28, 2021	🛡️ Oct 2021	Previous
G998BXXS3AUHD Changelog details (1 notes) The security of your device has been improved.	Android 11	Sep 09, 2021	🛡️ Sep 2021	Previous
G998BXXU3AUHB Changelog details (1 notes) Overall stability of functions improved.	Android 11	Sep 02, 2021	🛡️ Aug 2021	Previous
G998BXXU3AUGM Changelog details (1 notes) Overall stability of functions improved.	Android 11	Aug 09, 2021	🛡️ Aug 2021	Previous
G998BXXU3AUG4 Changelog details (1 notes) The performance of Camera has been improved	Android 11	Jul 14, 2021	🛡️ Jul 2021	Previous
G998BXXU3AUF6 Changelog details (1 notes) The performance of Camera has been improved	Android 11	Jun 18, 2021	🛡️ Jun 2021	Previous
G998BXXU3AUE1 Changelog details (1 notes) Overall stability of functions improved.	Android 11	May 12, 2021	🛡️ May 2021	Previous
G998BXXU3AUDA Changelog details (4 notes) The performance of Camera has been improved Enhanced Quick Share Improve file sharing between Galaxy devices using Quick Share. The security of your device has been improved.	Android 11	May 03, 2021	🛡️ May 2021	Previous
G998BXXU2AUC8 Changelog details (2 notes) The performance of Camera has been improved Overall device performance has been improved.	Android 11	Mar 29, 2021	🛡️ Apr 2021	Previous
G998BXXS2AUBB Changelog details (1 notes) The security of your device has been improved.	Android 11	Mar 08, 2021	🛡️ Mar 2021	Previous
G998BXXU1AUB9 Changelog details (2 notes) The performance of Camera has been improved Overall device performance has been improved.	Android 11	Feb 18, 2021	🛡️ Feb 2021	Previous
G998BXXU1AUB3 Changelog details (2 notes) The performance of Camera has been improved Overall device performance has been improved.	Android 11	Feb 08, 2021	🛡️ Feb 2021	Previous
G998BXXU1AUAC Changelog details (2 notes) The performance of Camera has been improved Overall device performance has been improved.	Android 11	Jan 28, 2021	🛡️ Jan 2021	Previous
G998BXXU1AUA4 Changelog details (5 notes) The performance of Camera has been improved Wi-Fi connectivity and stability have been improved. The performance of Fingerprint recognition has been improved. Overall stability of functions improved. The security of your device has been improved.	Android 11	Jan 15, 2021	🛡️ Jan 2021	Previous

Support & Repair Information

🛠️ Need Hardware Repair or Diagnostic Assistance?

If your Galaxy S21 Ultra 5G is experiencing physical damage, battery degradation, screen flickering, charging port faults, or motherboard issues that cannot be resolved through software or user manuals, contact support assistance:

💻 Screen & Display Repair Original AMOLED/LCD display replacement with genuine parts.

🔋 Battery Replacement Certified battery health diagnostics and fresh battery replacement.

📍 Service Center Locator Locate verified walk-in service desks in your city or region.

📞 Care Helpline & Booking Schedule a doorstep pickup or speak with a certified technician.

📋 Package Specifications & Build Details

Verified firmware binary structure and component tags for Galaxy S21 Ultra 5G:

✓ Verified Build

Build Number (PDA) G998BXXSJHZC2

CSC Build Code G998BOXMJHZC2

Baseband / Modem (CP) G998BXXSJHZA6

Operating System Android 15

Release Date March 26, 2026

Security Patch Level 🛡️ January 2026

Package Format 📦 4-File Factory Binary (.zip)

Total Package Size 💾 9 GB

Archive Structure & Odin Slot Guide

BL: Bootloader binary

AP: System core & recovery

CP: Modem & baseband

CSC: Regional carrier configuration

✨ Build Highlights

Security
The device is protected with improved security.

Frequently asked questions

Quick Answers

When should I update firmware on Galaxy S21 Ultra 5G?

One UI firmware updates provide Android security patches, new operating system features, bug fixes, and battery optimizations.

How can I update firmware on Galaxy S21 Ultra 5G?

You can update over-the-air (OTA) via Settings → Software update, or perform a complete verified system update via PC using Samsung Smart Switch.

Will updating firmware erase my user data?

Standard OTA and Smart Switch updates preserve your user data. However, performing a full backup before major OS updates is always recommended.

Download Galaxy S21 Ultra 5G Factory Stock Firmware

Verified package for Galaxy S21 Ultra 5G • Version G998BXXSJHZC2 • Released Mar 26, 2026:

⚡ High-Speed Download (9 GB) 📱 Odin-Ready ZIP 📦 4-File Factory Binary 🌐 Dual Cloud Mirrors

🔒 SHA-256 Verified ⚡ Fast Cloud Delivery 🛡️ 100% Clean & Verified ✓ Factory Stock Package

⚡

Odin Flashing Toolkit & Slot Guide

✓ Official 4-File Binary

To flash this official stock ROM package on Galaxy S21 Ultra 5G (SM-G998B), use the verified companion tools and slot mapping below:

🛠️ Odin Flash Tool v3.14.4 Official Windows flashing utility for Samsung Android firmware.

Download & Guide →

🔌 Samsung USB Driver Enables PC detection in Download Mode (Odin ID:COM port).

Download USB Drivers →

🛡️ Samsung Smart Switch Full desktop device backup before performing a firmware flash.

Download Smart Switch →

Odin 4-File Slot Mapping

BL (Bootloader) Select file starting with BL_...

AP (System Image) Select file starting with AP_...

CP (Modem / Radio) Select file starting with CP_...

CSC or HOME_CSC HOME_CSC retains data; CSC wipes device.

⚠️ Pro Caution: Ensure your battery is charged above 50% and do not unplug the USB cable until the green PASS! message appears in Odin.

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Hardware & Repair Support

Experiencing Hardware Damage or Component Failure on Galaxy S21 Ultra 5G?

If software flashing or driver installation does not resolve your device issue, compare genuine screen, battery, and motherboard replacement costs or visit a verified Samsung service center.

💰 View Spare Parts Price → 📍 Locate Service Center →

Authorized Repair Network

Ready to Repair Galaxy S21 Ultra 5G?

Find verified Samsung service centers across 646+ Indian cities with genuine OEM parts inventory, express turnaround, and in-warranty zero-cost claims.

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Samsung Galaxy S21 Ultra 5G (SM-G998B) Galaxy S21 Ultra 5G Factory Stock Firmware – Version G998BXXSJHZC2 for Android 15