A166BXXS7CZB6 – Galaxy A16 5G firmware

Build A166BXXS7CZB6 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 Mar 8, 2026 (method) and has reached 14 regions so far. It raises the bootloader bit from 6 to 7: once installed, the device no longer accepts firmware with bit 6 or lower, so a downgrade to A166BXXS6CZA8 is blocked. Samsung still serves this file.

Model
SM-A166B
Android
Android 16
Type
Security
Bootloader bit
7
First released
Mar 8, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received A166BXXS7CZB6, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
EUXEurope (Multi-CSC)Mar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
EUYEurope (Multi-CSC)Mar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
BOGFrance (Bouygues)Mar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
MEOPortugal (MEO)Mar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
MOBAustria (A1)Mar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
MOTSlovenia (Telekom)Mar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
MSRSerbiaMar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
PLSPoland (Plus)Mar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
PRTPoland (Play)Mar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
SFRFrance (SFR)Mar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
SIMSlovenia (A1)Mar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
TOPSerbia/MontenegroMar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
TURTurkeyMar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4
VIPCroatia (A1)Mar 8, 2026day 0A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4

Download and release notes

samloader download -m SM-A166B -r EUX -v A166BXXS7CZB6/A166BOXM7CZB6/A166BXXS7CZB4

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 A166BXXS7CZB6.