How to Install Stock ROM on Samsung SM-G991U (Firmware Guide)

On this page, we have shared the download link and guide to install the Samsung SM-G991U (Galaxy S21 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 carriers with Samsung SM-G991U.

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 5G Device Overview:

The Samsung Galaxy S21 features a 6.2-inch Dynamic AMOLED panel with a 120Hz refresh rate. The screen can go all the way up to 1300 nits under extreme sunlight conditions. It has a resolution of 1080 x 2400 pixels and an aspect ratio of 20:9 ratio. With the Samsung S20, we get the Exynos 2100 chip built on a 5nm manufacturing process. It is 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 get a rear quad-camera setup consisting of a 12MP primary sensor paired with an f/1.8 lens, a 12MP ultrawide sensor paired with an f/2.2 lens, and a 64MP telephoto sensor paired with an f/2.0 lens. Coming to the front, we get a single 10 MP sensor paired with an f/2.2 lens. The rear setup can capture 8K videos while the front setup is only limited to 4K video recording.