A166BXXS8CZDG – Galaxy A16 5G firmware

Build A166BXXS8CZDG 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 May 11, 2026 (method) and has reached 14 regions so far. It raises the bootloader bit from 7 to 8: once installed, the device no longer accepts firmware with bit 7 or lower, so a downgrade to A166BXXS7CZB6 is blocked. Samsung still serves this file.

Model
SM-A166B
Android
Android 16
Type
Security
Bootloader bit
8
First released
May 11, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received A166BXXS8CZDG, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
BOGFrance (Bouygues)May 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
EUXEurope (Multi-CSC)May 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
EUYEurope (Multi-CSC)May 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
MEOPortugal (MEO)May 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
MOBAustria (A1)May 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
MOTSlovenia (Telekom)May 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
MSRSerbiaMay 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
PLSPoland (Plus)May 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
PRTPoland (Play)May 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
SFRFrance (SFR)May 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
SIMSlovenia (A1)May 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
TOPSerbia/MontenegroMay 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
TURTurkeyMay 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG
VIPCroatia (A1)May 11, 2026day 0A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG

Download and release notes

samloader download -m SM-A166B -r EUX -v A166BXXS8CZDG/A166BOXM8CZDG/A166BXXS8CZDG

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 A166BXXS8CZDG.