A166MUBUAEZJ5 – Galaxy A16 5G firmware

Build A166MUBUAEZJ5 is a feature update for the Galaxy A16 5G (SM-A166M) on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 27, 2026 (method) and has reached 14 regions so far. It keeps bootloader bit 10, so downgrading to the previous build A166MUBSADZJA is still possible. Samsung still serves this file.

Model
SM-A166M
Android
Android 17
Type
Feature
Bootloader bit
10
First released
Oct 27, 2026
Regions
14

Not yet released in 21 regions that are still on an older build: CDR, CHE, CHL, CHO, CHT, CHX, COM, CRC, DOR, GLO, IUS, MXO, PEO, PET and 7 more.

Rollout timeline by region

The date each region code (CSC) first received A166MUBUAEZJ5, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
GTOGuatemalaOct 27, 2026day 0A166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
TPAPanamaOct 28, 2026+1 dayA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
ZTABrazil (Claro)Oct 29, 2026+2 daysA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
ZTMBrazil (TIM)Oct 29, 2026+2 daysA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
ZTOBrazilOct 29, 2026+2 daysA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
ZVVBrazil (Vivo)Oct 29, 2026+2 daysA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
CGUGuatemala (Claro)Oct 30, 2026+3 daysA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
COBColombia (Movistar)Nov 3, 2026+7 daysA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
COLColombiaNov 3, 2026+7 daysA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
COOColombiaNov 3, 2026+7 daysA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
AROArgentinaNov 10, 2026+14 daysA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
CTIArgentina (Claro)Nov 10, 2026+14 daysA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
PSNArgentina (Personal)Nov 10, 2026+14 daysA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5
UFNArgentina (Movistar)Nov 10, 2026+14 daysA166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5

Download and release notes

samloader download -m SM-A166M -r GTO -v A166MUBUAEZJ5/A166MOWOAEZJ5/A166MUBUAEZJ5

Samsung's release notes and security patch level for this update: SM-A166M / GTO on doc.samsungmobile.com. What each part of the build number means: decode A166MUBUAEZJ5.