Samsung Galaxy A16 5G (SM-A166U) Firmware Overview
What is the latest SM-A166U firmware?
A166USQUAEZJ5, released October 9, 2026 with Android 17. It is a feature update on bootloader binary 10. The archive holds 28 official builds across 13 regions (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy A16 5G still getting updates?
Yes. The newest build is from October 2026, and 8 of 13 regions already have a build from that month; the rest usually follow within a few weeks.
Which Android versions did it get?
The SM-A166U builds in the archive run Android 16 to 17. The earliest build we have for each version:
- Android 17: A166USQUAEZJ5 (Oct 2026), 8 builds in total
- Android 16: A166USQS9DZH1 (Aug 2026), 20 builds in total
Can I downgrade the SM-A166U firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. In the archive the binary of this model rose from 9 to 10:
- Binary 10 — since Sep 2026
- Binary 9 — since Aug 2026
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-A166U firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
A166USQUAEZJ5
Feature update
|
10 | AIO | 17 |
2026-10-09 | Download |
|
A166USQUAEZJ5
Feature update
|
10 | APP | 17 |
2026-10-09 | Download |
|
A166USQUAEZJ5
Feature update
|
10 | VPP | 17 |
2026-10-09 | Download |
|
A166USQUAEZJ5
Feature update
|
10 | ATT | 17 |
2026-10-09 | Download |
|
A166USQUAEZJ5
Feature update
|
10 | VZW | 17 |
2026-10-09 | Download |
|
A166USQUAEZJ5
Feature update
|
10 | USC | 17 |
2026-10-09 | Download |
|
A166USQUAEZJ5
Feature update
|
10 | TMK | 17 |
2026-10-09 | Download |
|
A166USQUAEZJ5
Feature update
|
10 | TMB | 17 |
2026-10-09 | Download |
|
A166USQSADZI2
Security update
|
10 | DSH | 16 |
2026-09-20 | Download |
|
A166USQSADZI2
Security update
|
10 | CCT | 16 |
2026-09-20 | Download |
|
A166USQSADZI2
Security update
|
10 | DSA | 16 |
2026-09-20 | Download |
|
A166USQSADZI2
Security update
|
10 | DSG | 16 |
2026-09-20 | Download |
|
A166USQSADZI2
Security update
|
10 | USC | 16 |
2026-09-20 | Download |
|
A166USQSADZI2
Security update
|
10 | TMB | 16 |
2026-09-20 | Download |
|
A166USQSADZI2
Security update
|
10 | AIO | 16 |
2026-09-20 | Download |
|
A166USQSADZI2
Security update
|
10 | ATT | 16 |
2026-09-20 | Download |
|
A166USQSADZI2
Security update
|
10 | CHA | 16 |
2026-09-20 | Download |
|
A166USQSADZI2
Security update
|
10 | APP | 16 |
2026-09-20 | Download |
|
A166USQSADZI2
Security update
|
10 | TMK | 16 |
2026-09-20 | Download |
|
A166USQSADZI2
Security update
|
10 | VZW | 16 |
2026-09-20 | Download |
|
A166USQSADZI2
Security update
|
10 | VPP | 16 |
2026-09-20 | Download |
|
A166USQS9DZH1
Security update
|
9 | DSH | 16 |
2026-08-27 | Download |
|
A166USQS9DZH1
Security update
|
9 | CCT | 16 |
2026-08-27 | Download |
|
A166USQS9DZH1
Security update
|
9 | DSG | 16 |
2026-08-27 | Download |
|
A166USQS9DZH1
Security update
|
9 | USC | 16 |
2026-08-27 | Download |
|
A166USQS9DZH1
Security update
|
9 | AIO | 16 |
2026-08-27 | Download |
|
A166USQS9DZH1
Security update
|
9 | ATT | 16 |
2026-08-27 | Download |
|
A166USQS9DZH1
Security update
|
9 | CHA | 16 |
2026-08-27 | Download |
Latest SM-A166U 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 |
|---|---|---|---|---|
| AIO | A166USQUAEZJ5 | 10 | 17 | 2026-10-09 |
| APP | A166USQUAEZJ5 | 10 | 17 | 2026-10-09 |
| ATT | A166USQUAEZJ5 | 10 | 17 | 2026-10-09 |
| CCT | A166USQSADZI2 | 10 | 16 | 2026-09-20 |
| CHA | A166USQSADZI2 | 10 | 16 | 2026-09-20 |
| DSA | A166USQSADZI2 | 10 | 16 | 2026-09-20 |
| DSG | A166USQSADZI2 | 10 | 16 | 2026-09-20 |
| DSH | A166USQSADZI2 | 10 | 16 | 2026-09-20 |
| TMB | A166USQUAEZJ5 | 10 | 17 | 2026-10-09 |
| TMK | A166USQUAEZJ5 | 10 | 17 | 2026-10-09 |
| USC | A166USQUAEZJ5 | 10 | 17 | 2026-10-09 |
| VPP | A166USQUAEZJ5 | 10 | 17 | 2026-10-09 |
| VZW | A166USQUAEZJ5 | 10 | 17 | 2026-10-09 |
How to Flash SM-A166U Firmware
Put the Samsung Galaxy A16 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.