A166BXXSADZH1 – Galaxy A16 5G firmware

Build A166BXXSADZH1 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 Sep 6, 2026 (method) and has reached 14 regions so far. It raises the bootloader bit from 9 to 10: once installed, the device no longer accepts firmware with bit 9 or lower, so a downgrade to A166BXXS9DZG1 is blocked. Samsung still serves this file.

Model
SM-A166B
Android
Android 16
Type
Security
Bootloader bit
10
First released
Sep 6, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received A166BXXSADZH1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
BOGFrance (Bouygues)Sep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
EUXEurope (Multi-CSC)Sep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
EUYEurope (Multi-CSC)Sep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
MEOPortugal (MEO)Sep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
MOBAustria (A1)Sep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
MOTSlovenia (Telekom)Sep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
MSRSerbiaSep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
PLSPoland (Plus)Sep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
PRTPoland (Play)Sep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
SFRFrance (SFR)Sep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
SIMSlovenia (A1)Sep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
TOPSerbia/MontenegroSep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
TURTurkeySep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1
VIPCroatia (A1)Sep 6, 2026day 0A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1

Download and release notes

samloader download -m SM-A166B -r EUX -v A166BXXSADZH1/A166BOXMADZH1/A166BXXSADZH1

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 A166BXXSADZH1.