Samsung Galaxy A16 5G (SM-A166U1) Firmware Overview
What is the latest SM-A166U1 firmware?
A166U1UESADZI2, released September 22, 2026 with Android 16. It is a security update on bootloader binary 10. The archive holds 20 official builds across 20 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 September 2026, and 20 of 20 regions already have a build from that month; the rest usually follow within a few weeks.
Can I downgrade the SM-A166U1 firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. All decodable builds in the archive share binary 10:
- Binary 10 — since Sep 2026
All SM-A166U1 firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
A166U1UESADZI2
Security update
|
10 | PCT | 16 |
2026-09-22 | Download |
|
A166U1UESADZI3
Security update
|
10 | LLA | 16 |
2026-09-22 | Download |
|
A166U1UESADZI2
Security update
|
10 | CHA | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | ATC | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | TMK | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | ATT | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | VZW | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | XAA | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | TMB | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | LRA | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | DSG | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | AIO | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | DSH | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | XAG | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | CCT | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | ACG | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | XAR | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | USC | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | FKR | 16 |
2026-09-20 | Download |
|
A166U1UESADZI2
Security update
|
10 | DSA | 16 |
2026-09-20 | Download |
Latest SM-A166U1 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 |
|---|---|---|---|---|
| ACG | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| AIO | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| ATC | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| ATT | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| CCT | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| CHA | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| DSA | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| DSG | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| DSH | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| FKR | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| LLA | A166U1UESADZI3 | 10 | 16 | 2026-09-22 |
| LRA | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| PCT | A166U1UESADZI2 | 10 | 16 | 2026-09-22 |
| TMB | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| TMK | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| USC | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| VZW | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| XAA | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| XAG | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
| XAR | A166U1UESADZI2 | 10 | 16 | 2026-09-20 |
How to Flash SM-A166U1 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.