A556BXXUIEZJ1 – Galaxy A55 5G firmware

Build A556BXXUIEZJ1 is a feature update for the Galaxy A55 5G (SM-A556B) on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 25, 2026 (method) and has reached 16 regions so far. It keeps bootloader bit 18, so downgrading to the previous build A556BXXSIDZI3 is still possible. Samsung still serves this file.

Model
SM-A556B
Android
Android 17
Type
Feature
Bootloader bit
18
First released
Oct 25, 2026
Regions
16

Rollout timeline by region

The date each region code (CSC) first received A556BXXUIEZJ1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
BOGFrance (Bouygues)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
EUXEurope (Multi-CSC)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
EUYEurope (Multi-CSC)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
EVRUnited Kingdom (EE)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
MEOPortugal (MEO)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
MOBAustria (A1)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
MOTSlovenia (Telekom)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
MSRSerbiaOct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
O2CCzech Republic (O2)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
PLSPoland (Plus)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
PRTPoland (Play)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
SFRFrance (SFR)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
SIMSlovenia (A1)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
SWCSwitzerlandOct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
TOPSerbia/MontenegroOct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1
VIPCroatia (A1)Oct 25, 2026day 0A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1

Download and release notes

samloader download -m SM-A556B -r EUX -v A556BXXUIEZJ1/A556BOXMIEZJ1/A556BXXUIEZJ1

Samsung's release notes and security patch level for this update: SM-A556B / EUX on doc.samsungmobile.com. What each part of the build number means: decode A556BXXUIEZJ1.