Download Samsung Firmware SM-A266U1

Samsung Galaxy A26 5G

The latest firmware for Samsung Galaxy A26 5G (SM-A266U1) is A266U1UESACZJ1 with Android 16, released on October 19, 2026 for 2 regions (CSC). Every official firmware build for SM-A266U1, newest first: one row per build with all regions (CSC) that received it.

Latest build
A266U1UESACZJ1 Android 16 · 19 days ago
Builds
13 builds
Regions (CSC)
20 regions

Firmware builds for SM-A266U1

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/A266U1UESACZJ1

SM-A266U1 update history

SM-A266U1 started on Android 15 and has received 1 major Android upgrade; it now runs Android 16. The newest build, A266U1UESACZJ1, was released on October 19, 2026 with the September 2026 security patch. That patch (SMR Sep-2026) fixes 80 vulnerabilities, 20 of them critical. Over the last 12 months SM-A266U1 received 8 builds, spread over 8 different months. Samsung guarantees security updates for this model until March 27, 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-A266U1

• 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...

• Security
The device is protected with improved security.

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

Show 2 older builds

• 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.

Similar Models

Frequently Asked Questions

What is the latest Android version for SM-A266U1?

The newest firmware for SM-A266U1 runs Android 16: build A266U1UESACZJ1, released on October 19, 2026.

When did SM-A266U1 get its last update?

The latest build for SM-A266U1, A266U1UESACZJ1, was released on October 19, 2026 (9 days ago).

How often does SM-A266U1 get updates?

Over the last 12 months SM-A266U1 received 8 builds, with at least one new build in 8 different months.

Is the firmware for SM-A266U1 official?

Yes, all firmware files for SM-A266U1 are 100% official, original, and obtained directly from Samsung servers.

How to flash Samsung SM-A266U1 using Odin?

To flash SM-A266U1, 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-A266U1?

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-A266U1.