Samsung Galaxy A26 5G (SM-A266U) Firmware Overview
What is the latest SM-A266U firmware?
A266USQUADZJ5, released October 9, 2026 with Android 17. It is a feature update on bootloader binary 10. The archive holds 20 official builds across 2 regions (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy A26 5G still getting updates?
Yes. The newest build is from October 2026, and 1 of 2 regions already have a build from that month; the rest usually follow within a few weeks.
Which Android versions did it get?
The SM-A266U builds in the archive run Android 15 to 17. The earliest build we have for each version:
- Android 17: A266USQUADZJ5 (Oct 2026), 1 build in total
- Android 16: A266USQU4BYI2 (Sep 2025), 14 builds in total
- Android 15: A266USQS2AYC1 (Apr 2025), 5 builds in total
Can I downgrade the SM-A266U firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. In the archive the binary of this model rose from 2 to 10:
- Binary 10 — since Aug 2026
- Binary 9 — since Jul 2026
- Binary 8 — since Apr 2026
- Binary 7 — since Feb 2026
- Binary 6 — since Jan 2026
- Binary 5 — since Nov 2025
- Binary 4 — since Aug 2025
- Binary 3 — since Jul 2025
- Binary 2 — since Mar 2025
A phone already on binary 10 rejects builds with a lower binary in Odin ("SW REV CHECK FAIL"), so it can go back to an earlier Android version only if that version has a binary 10 build. How to read a build number.
All SM-A266U firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
A266USQUADZJ5
Feature update
|
10 | USC | 17 |
2026-10-09 | Download |
|
A266USQSACZH3
Security update
|
10 | CCT | 16 |
2026-08-31 | Download |
|
A266USQSACZH3
Security update
|
10 | USC | 16 |
2026-08-31 | Download |
|
A266USQS9CZG2
Security update
|
9 | USC | 16 |
2026-08-03 | Download |
|
A266USQS9CZG2
Security update
|
9 | CCT | 16 |
2026-07-14 | Download |
|
A266USQS8BZD4
Security update
|
8 | USC | 16 |
2026-04-20 | Download |
|
A266USQS8BZD4
Security update
|
8 | CCT | 16 |
2026-04-20 | Download |
|
A266USQS7BZB6
Security update
|
7 | USC | 16 |
2026-02-19 | Download |
|
A266USQS7BZB6
Security update
|
7 | CCT | 16 |
2026-02-19 | Download |
|
A266USQS6BZA2
Security update
|
6 | USC | 16 |
2026-01-19 | Download |
|
A266USQS6BZA2
Security update
|
6 | CCT | 16 |
2026-01-19 | Download |
|
A266USQS5BYK2
Security update
|
5 | USC | 16 |
2025-11-12 | Download |
|
A266USQS5BYK2
Security update
|
5 | CCT | 16 |
2025-11-12 | Download |
|
A266USQU4BYI2
Feature update
|
4 | CCT | 16 |
2025-09-15 | Download |
|
A266USQU4BYI2
Feature update
|
4 | USC | 16 |
2025-09-15 | Download |
|
A266USQS4AYH1
Security update
|
4 | CCT | 15 |
2025-08-06 | Download |
|
A266USQS4AYH1
Security update
|
4 | USC | 15 |
2025-08-06 | Download |
|
A266USQS3AYG3
Security update
|
3 | CCT | 15 |
2025-07-09 | Download |
|
A266USQS3AYG3
Security update
|
3 | USC | 15 |
2025-07-09 | Download |
|
A266USQS2AYC1
Security update
|
2 | USC | 15 |
2025-04-02 | Download |
Latest SM-A266U Firmware by Region
The newest build for each region (CSC) code. Not sure which region your phone uses? See the CSC code guide.
| Region | Latest build | Bit | Android | Date |
|---|---|---|---|---|
| CCT | A266USQSACZH3 | 10 | 16 | 2026-08-31 |
| USC | A266USQUADZJ5 | 10 | 17 | 2026-10-09 |
How to Flash SM-A266U Firmware
Put the Samsung Galaxy A26 5G into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Pick a build with Bit 10 or higher if your phone is already on the latest firmware. Use HOME_CSC to keep your data, CSC for a full wipe.