Galaxy A56 5G SM-A566U1 firmware
The latest stable build is A566U1UEUBDZJ1 (Android 17, feature update), first released on Oct 19, 2026 – 18 days ago. Samsung has published 18 stable builds for this model since Jun 29, 2025: 14 security and 4 feature updates, from Android 15 to Android 17. The current bootloader (binary) version is 11. A device on bit 11 only accepts firmware with bit 11 or higher – see downgrading and the bootloader bit.
- Latest build
A566U1UEUBDZJ1- Released
- Oct 19, 2026
- Android
- Android 17
- Bootloader bit
- 11
- Regions
- 11
- Stable builds
- 18
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) | A566U1UEUBDZJ1 | Android 17 | Oct 19, 2026 | 18 |
AIO | USA (Cricket) | A566U1UEUBDZJ1 | Android 17 | Oct 19, 2026 | 18 |
ATT | USA (AT&T) | A566U1UEUBDZJ1 | Android 17 | Oct 19, 2026 | 18 |
CCT | USA (Comcast) | A566U1UEUBDZJ1 | Android 17 | Oct 19, 2026 | 18 |
LRA | USA (Bluegrass) | A566U1UEUBDZJ1 | Android 17 | Oct 19, 2026 | 18 |
TMB | USA (T-Mobile) | A566U1UEUBDZJ1 | Android 17 | Oct 19, 2026 | 18 |
TMK | USA (MetroPCS) | A566U1UEUBDZJ1 | Android 17 | Oct 19, 2026 | 18 |
USC | USA (US Cellular) | A566U1UEUBDZJ1 | Android 17 | Oct 19, 2026 | 18 |
VZW | USA (Verizon) | A566U1UEUBDZJ1 | Android 17 | Oct 19, 2026 | 18 |
XAA | USA (unlocked) | A566U1UEUBDZJ1 | Android 17 | Oct 19, 2026 | 18 |
XAR | USA (Cellular South) | A566U1UEUBDZJ1 | Android 17 | Oct 19, 2026 | 18 |
Firmware history (18 builds)
Every stable build (PDA version) Samsung has published for the SM-A566U1, 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 |
|---|---|---|---|---|---|---|
A566U1UEUBDZJ1 | Oct 19, 2026 | Android 17 | Feature | 11 | 11 | on server |
A566U1UESBCZI2 | Sep 15, 2026 | Android 16 | Security | 11 | 11 | on server |
A566U1UESACZHB | Sep 1, 2026 | Android 16 | Security | 10 | 11 | on server |
A566U1UES9CZG7 | Jul 26, 2026 | Android 16 | Security | 9 | 11 | on server |
A566U1UES8CZF6 | Jun 30, 2026 | Android 16 | Security | 8 | 11 | on server |
A566U1UES7CZE5 | May 28, 2026 | Android 16 | Security | 7 | 11 | on server |
A566U1UEU7CZE2 | May 20, 2026 | Android 16 | Feature | 7 | 11 | on server |
A566U1UES7BZD1 | Apr 28, 2026 | Android 16 | Security | 7 | 11 | on server |
A566U1UES6BZC4 | Mar 30, 2026 | Android 16 | Security | 6 | 11 | on server |
A566U1UES6BZB7 | Mar 2, 2026 | Android 16 | Security | 6 | 11 | on server |
A566U1UES5BZA7 | Feb 2, 2026 | Android 16 | Security | 5 | 11 | on server |
A566U1UES4BYL2 | Dec 17, 2025 | Android 16 | Security | 4 | 11 | on server |
A566U1UES4BYK2 | Nov 19, 2025 | Android 16 | Security | 4 | 11 | on server |
A566U1UES3BYJ2 | Oct 31, 2025 | Android 16 | Security | 3 | 11 | on server |
A566U1UEU3BYIB | Sep 29, 2025 | Android 16 | Feature | 3 | 11 | on server |
A566U1UES3AYH1 | Aug 19, 2025 | Android 15 | Security | 3 | 11 | on server |
A566U1UES2AYG1 | Jul 23, 2025 | Android 15 | Security | 2 | 11 | on server |
A566U1UEU1AYFA | Jun 29, 2025 | Android 15 | Feature | 1 | 11 | on server |
How to download SM-A566U1 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-A566U1 -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-A566U1 / XAA release notes on doc.samsungmobile.com. Each region page here links to the notes for that code.