A166BXXS9DZG1 – Galaxy A16 5G firmware

Build A166BXXS9DZG1 is a security update for the Galaxy A16 5G (SM-A166B) on Android 16 (One UI 8). It first appeared on Samsung's servers on Jul 27, 2026 (method) and has reached 14 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 A166BXXU8DZE9 is blocked. Samsung still serves this file.

Model
SM-A166B
Android
Android 16
Type
Security
Bootloader bit
9
First released
Jul 27, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received A166BXXS9DZG1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
BOGFrance (Bouygues)Jul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
EUXEurope (Multi-CSC)Jul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
EUYEurope (Multi-CSC)Jul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
MEOPortugal (MEO)Jul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
MOBAustria (A1)Jul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
MOTSlovenia (Telekom)Jul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
MSRSerbiaJul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
PLSPoland (Plus)Jul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
PRTPoland (Play)Jul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
SFRFrance (SFR)Jul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
SIMSlovenia (A1)Jul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
TOPSerbia/MontenegroJul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
TURTurkeyJul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1
VIPCroatia (A1)Jul 27, 2026day 0A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1

Download and release notes

samloader download -m SM-A166B -r EUX -v A166BXXS9DZG1/A166BOXM9DZG1/A166BXXS9DZG1

Samsung's release notes and security patch level for this update: SM-A166B / EUX on doc.samsungmobile.com. What each part of the build number means: decode A166BXXS9DZG1.