A166U1UEUAEZJ8 – Galaxy A16 5G firmware

Build A166U1UEUAEZJ8 is a feature update for the Galaxy A16 5G (SM-A166U1) on Android 17 (One UI 9). It first appeared on Samsung's servers on Nov 4, 2026 (method) and has reached 13 regions so far. It keeps bootloader bit 10, so downgrading to the previous build A166U1UESADZI2 is still possible. Samsung still serves this file.

Model
SM-A166U1
Android
Android 17
Type
Feature
Bootloader bit
10
First released
Nov 4, 2026
Regions
13

Rollout timeline by region

The date each region code (CSC) first received A166U1UEUAEZJ8, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Nov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8
AIOUSA (Cricket)Nov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8
ATTUSA (AT&T)Nov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8
CCTUSA (Comcast)Nov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8
DSAUSANov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8
DSHUSANov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8
LRAUSA (Bluegrass)Nov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8
TMBUSA (T-Mobile)Nov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8
TMKUSA (MetroPCS)Nov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8
USCUSA (US Cellular)Nov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8
VZWUSA (Verizon)Nov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8
XAAUSA (unlocked)Nov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8
XARUSA (Cellular South)Nov 4, 2026day 0A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8

Download and release notes

samloader download -m SM-A166U1 -r XAA -v A166U1UEUAEZJ8/A166U1OYMAEZJ8/A166U1UEUAEZJ8

Samsung's release notes and security patch level for this update: SM-A166U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode A166U1UEUAEZJ8.