How to Install Stock ROM on Samsung SM-G991U1 (Firmware Guide)

In this tutorial, we will guide you on how to install the Samsung SM-G991U1 (Galaxy S21 5G) flash file using the Samsung flash tool (also known as the ODIN flash tool). On this page, you will find the official stock firmware file for the Samsung Galaxy S21 5G SM-G991U1, drivers, and flash tool.

By flashing the Stock ROM file, you can always fix the device software issue such as boot loop, lag, soft brick or hard brick, remove pattern lock, FRP lock, and many more.

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.