Galaxy A26 5G SM-A266B firmware

The latest stable build is A266BXXUCDZJ5 (Android 17, feature update), first released on Oct 26, 2026 – 11 days ago. Samsung has published 36 stable builds for this model since Mar 6, 2025: 26 security and 10 feature updates, from Android 15 to Android 17. The current bootloader (binary) version is 12. A device on bit 12 only accepts firmware with bit 12 or higher – see downgrading and the bootloader bit.

Latest build

A266BXXUCDZJ5

Released

Oct 26, 2026

Android

Android 17

Bootloader bit

12

Regions

50

Stable builds

36

Latest firmware by region (CSC)

Samsung builds firmware per region code (CSC). Pick the code that matches your device – it is shown under Settings › About phone › Software information › Service provider software version. Follow a code for its complete history.

Firmware history (36 builds)

Every stable build (PDA version) Samsung has published for the SM-A266B, newest first. “
” is the earliest date the build appeared on Samsung's servers in any region. “
” means Samsung no longer serves the file for that build.

How to download SM-A266B firmware

We do not host firmware. Download it directly from Samsung's servers with a free open-source tool, for example samloader:

samloader download -m SM-A266B -r EUX

Replace EUX with your region code. Step-by-step instructions, including a graphical alternative: How to download Samsung firmware.

Changelog and security patch level

Samsung publishes the release notes for each update, including the security patch level, on its own site. They are listed per region – for example SM-A266B / EUX release notes on doc.samsungmobile.com. Each region page here links to the notes for that code.