How to Install Stock ROM on Samsung SM-G998U (Firmware Guide)

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 have shared the download link and guide to install the Samsung SM-G998U (Galaxy S21 Ultra 5G) firmware flash file using the Samsung Flash Tool (Also known as Odin Flash Tool). Here you will find all stock firmware zip files for all the supported regions with Samsung SM-G998U.

If you are someone who wants to restore the device back to factory firmware, then this guide is for you. By using this guide, you can fix certain software-related issues such as hard brick, soft brick, WiFi, or Bluetooth issue, fix lag or stutter or even you can downgrade the device anytime.

Samsung Galaxy S21 Ultra 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.

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.

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.

Samsung Galaxy S21 Ultra 5G SM-G998U Firmware Files:

Steps to Flash Stock ROM File on Galaxy S21 Ultra 5G SM-G998U

Before we get straight to the steps to Install Stock Firmware on your Samsung Galaxy S21 Ultra 5G, let us take a look at the pre-requirements first.

Pre-Requirements: 

• This Guide is for Samsung Galaxy S21 Ultra 5G SM-G998U
• You need a Windows PC/Laptop and a USB cable to flash the firmware.
• Charge your device with a minimum of 50% battery backup.
• You have to download the latest Samsung USB Drivers and install them on your PC.
• Make sure that you have ODIN Software installed on your PC.
• Take a backup of your device (No Root) before doing anything.

Now, let’s take a look at Steps to flash Stock ROM on Samsung Galaxy S21 Ultra 5G.

1. Download the Samsung SM-G998U firmware file
2. Extract the contents of the firmware flash file zip.
3. Launch the ODIN application
4. Load the firmware files in their appropriate section
5. Once you have loaded, now connect your phone to the computer (make sure to boot your device into download mode)
6. Notice that the CO port will light up on Odin once you connect your phone.
7. Click the Start button to install the firmware on your Samsung device.
8. That’s it! You will see a PASS message once the installation is complete.

Check out our full depth video guide as well.

We hope that this guide will be helpful to you. If in case, you’re facing any issues, feel free to ask in the comments below.