Galaxy A26 5G SM-A266U1 firmware
The latest stable build is A266U1UEUADZJ5 (Android 17, feature update), first released on Nov 2, 2026 – 4 days ago. Samsung has published 14 stable builds for this model since Mar 9, 2025: 9 security and 5 feature updates, from Android 15 to Android 17. The current bootloader (binary) version is 10. A device on bit 10 only accepts firmware with bit 10 or higher – see downgrading and the bootloader bit.
- Latest build
A266U1UEUADZJ5- Released
- Nov 2, 2026
- Android
- Android 17
- Bootloader bit
- 10
- Regions
- 13
- Stable builds
- 14
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.
| CSC | Region | Latest build | Android | Released | Builds |
|---|---|---|---|---|---|
ACG | USA (C Spire) | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
AIO | USA (Cricket) | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
ATT | USA (AT&T) | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
CCT | USA (Comcast) | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
DSA | USA | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
DSH | USA | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
LRA | USA (Bluegrass) | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
TMB | USA (T-Mobile) | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
TMK | USA (MetroPCS) | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
USC | USA (US Cellular) | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
VZW | USA (Verizon) | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
XAA | USA (unlocked) | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
XAR | USA (Cellular South) | A266U1UEUADZJ5 | Android 17 | Nov 2, 2026 | 14 |
Firmware history (14 builds)
Every stable build (PDA version) Samsung has published for the SM-A266U1, 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.
| Build (PDA) | Released | Android | Type | Bit | Regions | File |
|---|---|---|---|---|---|---|
A266U1UEUADZJ5 | Nov 2, 2026 | Android 17 | Feature | 10 | 13 | on server |
A266U1UESACZH3 | Sep 10, 2026 | Android 16 | Security | 10 | 13 | on server |
A266U1UES9CZG2 | Jul 30, 2026 | Android 16 | Security | 9 | 13 | on server |
A266U1UEU8CZEA | Jun 2, 2026 | Android 16 | Feature | 8 | 13 | on server |
A266U1UES8BZD4 | May 3, 2026 | Android 16 | Security | 8 | 13 | on server |
A266U1UES7BZB6 | Mar 17, 2026 | Android 16 | Security | 7 | 13 | on server |
A266U1UES6BZA3 | Feb 12, 2026 | Android 16 | Security | 6 | 13 | on server |
A266U1UES5BYK2 | Nov 23, 2025 | Android 16 | Security | 5 | 13 | on server |
A266U1UEU4BYI4 | Oct 8, 2025 | Android 16 | Feature | 4 | 13 | on server |
A266U1UES4AYH1 | Aug 20, 2025 | Android 15 | Security | 4 | 13 | on server |
A266U1UES3AYG1 | Jul 27, 2025 | Android 15 | Security | 3 | 13 | on server |
A266U1UEU2AYD8 | May 19, 2025 | Android 15 | Feature | 2 | 13 | on server |
A266U1UES2AYC1 | Apr 15, 2025 | Android 15 | Security | 2 | 13 | on server |
A266U1UEU1AYB7 | Mar 9, 2025 | Android 15 | Feature | 1 | 13 | on server |
How to download SM-A266U1 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-A266U1 -r XAAReplace XAA 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-A266U1 / XAA release notes on doc.samsungmobile.com. Each region page here links to the notes for that code.