A566EXXSECZI2 – Galaxy A56 5G firmware

Build A566EXXSECZI2 is a security update for the Galaxy A56 5G (SM-A566E) on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 15, 2026 (method) and has reached 41 regions so far. It raises the bootloader bit from 13 to 14: once installed, the device no longer accepts firmware with bit 13 or lower, so a downgrade to A566EXXSDCZHB is blocked. Samsung still serves this file.

Model
SM-A566E
Android
Android 16
Type
Security
Bootloader bit
14
First released
Sep 15, 2026
Regions
41

Rollout timeline by region

The date each region code (CSC) first received A566EXXSECZI2, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
CAUCaucasusSep 15, 2026day 0A566EXXSECZI2/A566EOXEECZI2/A566EXXSECZI2
SERRussiaSep 15, 2026day 0A566EXXSECZI2/A566EOXEECZI2/A566EXXSECZI2
SKZKazakhstanSep 15, 2026day 0A566EXXSECZI2/A566EOXEECZI2/A566EXXSECZI2
GTOGuatemalaSep 16, 2026+1 dayA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
AROArgentinaSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
BVOBoliviaSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
CDRDominican RepublicSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
CGUGuatemala (Claro)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
COBColombia (Movistar)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
COLColombiaSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
COMColombia (Claro)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
COOColombiaSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
CRCCosta RicaSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
CTIArgentina (Claro)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
DORDominican RepublicSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
EBEEcuadorSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
ECOEcuadorSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
GLONigeria (Glo)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
IUSMexico (AT&T)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
MXOMexicoSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
PEOPeruSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
PETPeru (Movistar)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
PGUGuatemalaSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
PNTPanamaSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
PSNArgentina (Personal)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
SAMOceaniaSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
TCEMexico (Telcel)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
TGPParaguaySep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
TMMMyanmarSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
TPAPanamaSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
UFNArgentina (Movistar)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
UPOUruguaySep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
UYOUruguaySep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
ZTABrazil (Claro)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
ZTMBrazil (TIM)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
ZTOBrazilSep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
ZVVBrazil (Vivo)Sep 17, 2026+2 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
CHEChile (Entel)Sep 24, 2026+9 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
CHLChile (Claro)Sep 24, 2026+9 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
CHOChileSep 24, 2026+9 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2
CHTChile (Movistar)Sep 24, 2026+9 daysA566EXXSECZI2/A566EOWOECZI2/A566EXXSECZI2

Download and release notes

samloader download -m SM-A566E -r CAU -v A566EXXSECZI2/A566EOXEECZI2/A566EXXSECZI2

Samsung's release notes and security patch level for this update: SM-A566E / CAU on doc.samsungmobile.com. What each part of the build number means: decode A566EXXSECZI2.