A166EXXS9DZG1 – Galaxy A16 5G firmware
Build A166EXXS9DZG1 is a security update for the Galaxy A16 5G (SM-A166E)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Jul 27, 2026 (method) and has reached
4 regions so far. It raises the bootloader bit from 8 to 9: once installed, the device no longer accepts firmware with bit 8 or lower, so a downgrade to A166EXXU8DZE9 is blocked. Samsung still serves this file.
- Model
- SM-A166E
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 9
- First released
- Jul 27, 2026
- Regions
- 4
Rollout timeline by region
The date each region code (CSC) first received A166EXXS9DZG1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
KSA | Saudi Arabia | Jul 27, 2026 | day 0 | A166EXXS9DZG1/A166EOJM9DZG1/A166EXXS9DZG1 |
MID | Middle East | Jul 27, 2026 | day 0 | A166EXXS9DZG1/A166EOJM9DZG1/A166EXXS9DZG1 |
TUN | Tunisia | Jul 27, 2026 | day 0 | A166EXXS9DZG1/A166EOJM9DZG1/A166EXXS9DZG1 |
XSG | United Arab Emirates | Jul 27, 2026 | day 0 | A166EXXS9DZG1/A166EOJM9DZG1/A166EXXS9DZG1 |
Download and release notes
samloader download -m SM-A166E -r KSA -v A166EXXS9DZG1/A166EOJM9DZG1/A166EXXS9DZG1Samsung's release notes and security patch level for this update: SM-A166E / KSA on doc.samsungmobile.com. What each part of the build number means: decode A166EXXS9DZG1.