Galaxy A26 5G

Samsung Galaxy A26 5G SM-A266U firmware

The latest firmware for Samsung Galaxy A26 5G (SM-A266U) is A266USQUADZJ5 with Android 17, released on October 27, 2026 for 1 region (CSC). Every official firmware build for SM-A266U, newest first: one row per build with all regions (CSC) that received it.

Latest build
A266USQUADZJ5 Android 17 · 1 month ago
Builds
13 builds
Regions (CSC)
2 regions

Firmware builds for SM-A266U

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/A266USQUADZJ5

SM-A266U update history

SM-A266U started on Android 15 and has received 2 major Android upgrades; it now runs Android 17. The upgrade to Android 17 started rolling out on October 27, 2026. The newest build, A266USQUADZJ5, was released on October 27, 2026 with the October 2026 security patch. That patch (SMR Oct-2026) fixes 62 vulnerabilities, 9 of them critical. Over the last 12 months SM-A266U received 8 builds, spread over 8 different months. Samsung guarantees security updates for this model until March 13, 2031.

Device specifications

Launched with
Android 15
Display diagonal
17 cm (6.7")
Display resolution
1080 x 2340 pixels
RAM
6 GB
Rear camera resolution
50 MP
Rear camera type
Triple camera
Battery capacity
5000 mAh
Weight
200 g

Specifications of SM-A266B, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

Changelog for SM-A266U

One UI 9
Productivity and multitasking

More customizable quick panel
You can now rearrange and customize the controls in your quick panel even more than before. You can change the size of the brightness and volume sliders as well as the media player. You can also separate the sound mode button from the volume slider.

Privacy, security, and device protection

Warranty and care
The new Warranty and care menu in settings lets you check your warranty information and access diagnostic checks a...

• Security
The device is protected with improved security.

These changes may vary depending on the model, country, or network operator of the customer environment.

One UI 8.5
Visual design

Fresh new look
One UI seamlessly integrates into your daily routine by combining immersive visuals with meaningful personalization for a more refined and sophisticated design. Transparent blur effects add depth and make content easier to navigate, while floating elements react organically to your workflow for a more focused experience. Through familiar and intuitive data visualization, One UI delivers a design that feels both personal and relatable, helping you focus...

• Security
The device is protected with improved security.

These changes may vary depending on the model, country, or network operator of the customer environment.

One UI 8.0 (Android 16)
Productivity

Check stock prices without unlocking
Stocks you follow on Google Finance with big price changes will appear on your Now bar at the end of the trading day.

Easier file sharing with Quick Share
It's never been easier to send and receive files. Tap the Quick Share button in quick settings to get started. You can receive files while the Quick Share screen is open and send files to others directly from Quick Share.

Sticky notes
Add quick annotations on top o...

Show 4 older builds

• Security
The device is protected with improved security.

These changes may vary depending on the model, country, or network operator of the customer environment.

• Press and hold the Side button to access Google Gemini
The Side button is a new way to access Google Gemini or other digital assistant app quickly instead of using the corner swipe. You can change what the Side button does in Settings.
• Complete multiple tasks with one ask
Google Gemini is now seamlessly integrated with Samsung apps such as Calendar, Notes, Reminder, and Clock. You can complete tasks in these apps using information from Gemini with one simple command. Try asking Google Gemini...

• Security
The device is protected with improved security.

New firmware for other devices

All latest builds

Similar Models

Frequently Asked Questions

What is the latest Android version for SM-A266U?

The newest firmware for SM-A266U runs Android 17: build A266USQUADZJ5, released on October 27, 2026.

When did SM-A266U get its last update?

The latest build for SM-A266U, A266USQUADZJ5, was released on October 27, 2026 (18 days ago).

How often does SM-A266U get updates?

Over the last 12 months SM-A266U received 8 builds, with at least one new build in 8 different months.

Is the firmware for SM-A266U official?

Yes, all firmware files for SM-A266U are 100% official, original, and obtained directly from Samsung servers.

How to flash Samsung SM-A266U using Odin?

To flash SM-A266U, 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-A266U?

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-A266U.

Is this the stock ROM or flash file for SM-A266U?

Yes. Every build on this page is the official stock ROM for SM-A266U from Samsung's update server, the same package other sites call the flash file or the software update. It installs with Odin on a Windows PC.

Does flashing firmware remove the FRP lock on SM-A266U?

No. Factory Reset Protection is tied to the Google account that was on the phone and survives a firmware flash. Sign in with that account or use the legal options in our FRP guide.