A166MUBS8CZDG – Galaxy A16 5G firmware

Build A166MUBS8CZDG is a security update for the Galaxy A16 5G (SM-A166M) on Android 16 (One UI 8). It first appeared on Samsung's servers on May 12, 2026 (method) and has reached 34 regions so far. It keeps bootloader bit 8, so downgrading to the previous build A166MUBS8CZDC is still possible. Samsung still serves this file.

Model
SM-A166M
Android
Android 16
Type
Security
Bootloader bit
8
First released
May 12, 2026
Regions
34

Rollout timeline by region

The date each region code (CSC) first received A166MUBS8CZDG, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
AROArgentinaMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
CDRDominican RepublicMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
CGUGuatemala (Claro)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
COBColombia (Movistar)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
COLColombiaMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
COMColombia (Claro)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
COOColombiaMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
CRCCosta RicaMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
CTIArgentina (Claro)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
DORDominican RepublicMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
GLONigeria (Glo)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
GTOGuatemalaMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
IUSMexico (AT&T)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
MXOMexicoMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
PEOPeruMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
PETPeru (Movistar)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
PGUGuatemalaMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
PNTPanamaMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
PSNArgentina (Personal)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
SAMOceaniaMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
TCEMexico (Telcel)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
TMMMyanmarMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
TPAPanamaMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
UFNArgentina (Movistar)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
UYOUruguayMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
ZTABrazil (Claro)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
ZTMBrazil (TIM)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
ZTOBrazilMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
ZVVBrazil (Vivo)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
CHEChile (Entel)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
CHLChile (Claro)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
CHOChileMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
CHTChile (Movistar)May 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG
CHXChileMay 12, 2026day 0A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG

Download and release notes

samloader download -m SM-A166M -r ARO -v A166MUBS8CZDG/A166MOWO8CZDG/A166MUBS8CZDG

Samsung's release notes and security patch level for this update: SM-A166M / ARO on doc.samsungmobile.com. What each part of the build number means: decode A166MUBS8CZDG.