Galaxy S21 5G

Download Samsung Firmware SM-G991Q

Samsung Galaxy S21 5G

The latest firmware for Samsung Galaxy S21 5G (SM-G991Q) is G991QOPS1EYJ1 with Android 15, released on November 20, 2025 for 1 region (CSC). Every official firmware build for SM-G991Q, newest first: one row per build with all regions (CSC) that received it.

Latest build
G991QOPS1EYJ1 Android 15 · 11 months ago
Builds
17 builds
Regions (CSC)
1 region

Firmware builds for SM-G991Q

Each firmware build has its own page at https://samfirm.shop/build/{PDA}, where {PDA} is the build number from the list above. Example: https://samfirm.shop/build/G991QOPS1EYJ1

SM-G991Q update history

SM-G991Q started on Android 11 and has received 4 major Android upgrades; it now runs Android 15. The newest build, G991QOPS1EYJ1, was released on November 20, 2025 with the September 2025 security patch. That patch (SMR Sep-2025) fixes 70 vulnerabilities, 3 of them critical. No new build has appeared for 11 months, so regular updates for this model have most likely ended.

Device specifications

Display diagonal
15.8 cm (6.2")
Display resolution
2400 x 1080 pixels
Display type
Dynamic AMOLED 2X
RAM
8 GB
Rear camera resolution
12 MP
Rear camera type
Triple camera
Battery capacity
4000 mAh
Weight
171 g

Specifications of SM-G991, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

Changelog for SM-G991Q

· Device stability improvements, bug fixes.
· New and / or enhanced features.
· Further improvements to performance.

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
Fr...

· Device stability improvements, bug fixes.
· New and / or enhanced features.
· Further improvements to performance.

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,...

One UI 6.0 Upgrade (Android 14)
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 ap...

Show 13 older builds

· Device stability improvements, bug fixes.
· New and / or enhanced features.
· Further improvements to performance.

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 swi...

· Device stability improvements, bug fixes.
· New and / or enhanced features.
· Further improvements to performance.

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...

· Device stability improvements, bug fixes.
· New and / or enhanced features.
· Further improvements to performance.

Similar Models

Frequently Asked Questions

What is the latest Android version for SM-G991Q?

The newest firmware for SM-G991Q runs Android 15: build G991QOPS1EYJ1, released on November 20, 2025.

When did SM-G991Q get its last update?

The latest build for SM-G991Q, G991QOPS1EYJ1, was released on November 20, 2025 (11 months ago).

How often does SM-G991Q get updates?

SM-G991Q has had no new firmware for 11 months, so regular updates have most likely ended.

Is the firmware for SM-G991Q official?

Yes, all firmware files for SM-G991Q are 100% official, original, and obtained directly from Samsung servers.

How to flash Samsung SM-G991Q using Odin?

To flash SM-G991Q, you need to download the appropriate firmware, put your device into Download Mode, and use the Odin tool to load the BL, AP, CP, and CSC files.

Can I downgrade the Android version on SM-G991Q?

Downgrading is only possible if the bootloader version (binary bit) of the old firmware matches the current one. Always check the binary version before flashing SM-G991Q.