A556EXXSIDZI3 – Galaxy A55 5G firmware

Build A556EXXSIDZI3 is a security update for the Galaxy A55 5G (SM-A556E) on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 20, 2026 (method) and has reached 82 regions so far. It raises the bootloader bit from 17 to 18: once installed, the device no longer accepts firmware with bit 17 or lower, so a downgrade to A556EXXSHDZH6 is blocked. Samsung still serves this file.

Model
SM-A556E
Android
Android 16
Type
Security
Bootloader bit
18
First released
Sep 20, 2026
Regions
82

Rollout timeline by region

The date each region code (CSC) first received A556EXXSIDZI3, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
AFGAfghanistanSep 20, 2026day 0A556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
EGYEgyptSep 20, 2026day 0A556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
KSASaudi ArabiaSep 20, 2026day 0A556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
LYSLibyaSep 20, 2026day 0A556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
MIDMiddle EastSep 20, 2026day 0A556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
PAKPakistanSep 20, 2026day 0A556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
TUNTunisiaSep 20, 2026day 0A556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
XSGUnited Arab EmiratesSep 20, 2026day 0A556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
BKDBangladeshSep 20, 2026day 0A556EXXSIDZI3/A556EODMIDZI3/A556EXXSIDZI3
BNGBelgiumSep 20, 2026day 0A556EXXSIDZI3/A556EODMIDZI3/A556EXXSIDZI3
INSIndiaSep 20, 2026day 0A556EXXSIDZI3/A556EODMIDZI3/A556EXXSIDZI3
NPBNepalSep 20, 2026day 0A556EXXSIDZI3/A556EODMIDZI3/A556EXXSIDZI3
SLKSri LankaSep 20, 2026day 0A556EXXSIDZI3/A556EODMIDZI3/A556EXXSIDZI3
THLThailandSep 20, 2026day 0A556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
XXVVietnamSep 20, 2026day 0A556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
CAUCaucasusSep 20, 2026day 0A556EXXSIDZI3/A556EOXEIDZI3/A556EXXSIDZI3
SERRussiaSep 20, 2026day 0A556EXXSIDZI3/A556EOXEIDZI3/A556EXXSIDZI3
SKZKazakhstanSep 20, 2026day 0A556EXXSIDZI3/A556EOXEIDZI3/A556EXXSIDZI3
GTOGuatemalaSep 22, 2026+2 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
ACRGhanaSep 22, 2026+2 daysA556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
AFRAfricaSep 22, 2026+2 daysA556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
DKRSenegalSep 22, 2026+2 daysA556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
ECTNigeriaSep 22, 2026+2 daysA556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
GLBPhilippines (Globe)Sep 22, 2026+2 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
MWDMoroccoSep 22, 2026+2 daysA556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
MYMMyanmarSep 22, 2026+2 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
PKDPakistanSep 22, 2026+2 daysA556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
TURTurkeySep 22, 2026+2 daysA556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
XFASouth AfricaSep 22, 2026+2 daysA556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
XFESouth AfricaSep 22, 2026+2 daysA556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
XFVSouth Africa (Vodacom)Sep 22, 2026+2 daysA556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3
XIDIndonesiaSep 22, 2026+2 daysA556EXXSIDZI3/A556EOLEIDZI3/A556EXXSIDZI3
XMEMalaysiaSep 22, 2026+2 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
XNZNew ZealandSep 22, 2026+2 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
XTCPhilippinesSep 22, 2026+2 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
BVOBoliviaSep 22, 2026+2 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
CDRDominican RepublicSep 22, 2026+2 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
CGUGuatemala (Claro)Sep 22, 2026+2 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
COMColombia (Claro)Sep 22, 2026+2 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
PGUGuatemalaSep 22, 2026+2 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
TPAPanamaSep 22, 2026+2 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
ZTABrazil (Claro)Sep 22, 2026+2 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
ZTMBrazil (TIM)Sep 22, 2026+2 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
ZTOBrazilSep 22, 2026+2 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
ZVVBrazil (Vivo)Sep 22, 2026+2 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
OPSAustralia (Optus)Sep 23, 2026+3 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
TELAustralia (Telstra)Sep 23, 2026+3 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
VAUAustralia (Vodafone)Sep 23, 2026+3 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
XSAAustraliaSep 23, 2026+3 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
IUSMexico (AT&T)Sep 23, 2026+3 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
MXOMexicoSep 23, 2026+3 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
TCEMexico (Telcel)Sep 23, 2026+3 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
TMMMyanmarSep 23, 2026+3 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
AROArgentinaSep 24, 2026+4 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
COBColombia (Movistar)Sep 24, 2026+4 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
COLColombiaSep 24, 2026+4 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
COOColombiaSep 24, 2026+4 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
CTIArgentina (Claro)Sep 24, 2026+4 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
PEOPeruSep 24, 2026+4 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
PETPeru (Movistar)Sep 24, 2026+4 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
PNTPanamaSep 24, 2026+4 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
PSNArgentina (Personal)Sep 24, 2026+4 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
SAMOceaniaSep 24, 2026+4 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
UFNArgentina (Movistar)Sep 24, 2026+4 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
UYOUruguaySep 24, 2026+4 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
MM1Singapore (M1)Sep 28, 2026+8 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
SINSingapore (Singtel)Sep 28, 2026+8 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
STHSingapore (StarHub)Sep 28, 2026+8 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
XSPSingaporeSep 28, 2026+8 daysA556EXXSIDZI3/A556EOLMIDZI3/A556EXXSIDZI3
CRCCosta RicaSep 29, 2026+9 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
DORDominican RepublicSep 29, 2026+9 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
GLONigeria (Glo)Sep 29, 2026+9 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
TGPParaguaySep 29, 2026+9 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
UPOUruguaySep 29, 2026+9 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
CHEChile (Entel)Sep 30, 2026+10 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
CHLChile (Claro)Sep 30, 2026+10 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
CHOChileSep 30, 2026+10 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
CHTChile (Movistar)Sep 30, 2026+10 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
CHXChileSep 30, 2026+10 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
EBEEcuadorSep 30, 2026+10 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
ECOEcuadorSep 30, 2026+10 daysA556EXXSIDZI3/A556EOWOIDZI3/A556EXXSIDZI3
ILOIsraelOct 4, 2026+14 daysA556EXXSIDZI3/A556EOJMIDZI3/A556EXXSIDZI3

Download and release notes

samloader download -m SM-A556E -r INS -v A556EXXSIDZI3/A556EODMIDZI3/A556EXXSIDZI3

Samsung's release notes and security patch level for this update: SM-A556E / INS on doc.samsungmobile.com. What each part of the build number means: decode A556EXXSIDZI3.