A566U1UEUBDZJ1 – Galaxy A56 5G firmware

Build A566U1UEUBDZJ1 is a feature update for the Galaxy A56 5G (SM-A566U1) on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 19, 2026 (method) and has reached 11 regions so far. It keeps bootloader bit 11, so downgrading to the previous build A566U1UESBCZI2 is still possible. Samsung still serves this file.

Model
SM-A566U1
Android
Android 17
Type
Feature
Bootloader bit
11
First released
Oct 19, 2026
Regions
11

Rollout timeline by region

The date each region code (CSC) first received A566U1UEUBDZJ1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Oct 19, 2026day 0A566U1UEUBDZJ1/A566U1OYMBDZJ1/A566U1UEUBDZJ1
AIOUSA (Cricket)Oct 19, 2026day 0A566U1UEUBDZJ1/A566U1OYMBDZJ1/A566U1UEUBDZJ1
ATTUSA (AT&T)Oct 19, 2026day 0A566U1UEUBDZJ1/A566U1OYMBDZJ1/A566U1UEUBDZJ1
CCTUSA (Comcast)Oct 19, 2026day 0A566U1UEUBDZJ1/A566U1OYMBDZJ1/A566U1UEUBDZJ1
LRAUSA (Bluegrass)Oct 19, 2026day 0A566U1UEUBDZJ1/A566U1OYMBDZJ1/A566U1UEUBDZJ1
TMBUSA (T-Mobile)Oct 19, 2026day 0A566U1UEUBDZJ1/A566U1OYMBDZJ1/A566U1UEUBDZJ1
TMKUSA (MetroPCS)Oct 19, 2026day 0A566U1UEUBDZJ1/A566U1OYMBDZJ1/A566U1UEUBDZJ1
USCUSA (US Cellular)Oct 19, 2026day 0A566U1UEUBDZJ1/A566U1OYMBDZJ1/A566U1UEUBDZJ1
VZWUSA (Verizon)Oct 19, 2026day 0A566U1UEUBDZJ1/A566U1OYMBDZJ1/A566U1UEUBDZJ1
XAAUSA (unlocked)Oct 19, 2026day 0A566U1UEUBDZJ1/A566U1OYMBDZJ1/A566U1UEUBDZJ1
XARUSA (Cellular South)Oct 19, 2026day 0A566U1UEUBDZJ1/A566U1OYMBDZJ1/A566U1UEUBDZJ1

Download and release notes

samloader download -m SM-A566U1 -r XAA -v A566U1UEUBDZJ1/A566U1OYMBDZJ1/A566U1UEUBDZJ1

Samsung's release notes and security patch level for this update: SM-A566U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode A566U1UEUBDZJ1.