S921BXXSHDZH3 – Galaxy S24 firmware

Build S921BXXSHDZH3 is a security update for the Galaxy S24 (SM-S921B) on Android 16 (One UI 8). It first appeared on Samsung's servers on Aug 30, 2026 (method) and has reached 95 regions so far. It raises the bootloader bit from 16 to 17: once installed, the device no longer accepts firmware with bit 16 or lower, so a downgrade to S921BXXSGDZG1 is blocked. Samsung still serves this file.

Model
SM-S921B
Android
Android 16
Type
Security
Bootloader bit
17
First released
Aug 30, 2026
Regions
95

Rollout timeline by region

The date each region code (CSC) first received S921BXXSHDZH3, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
BOGFrance (Bouygues)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
EUXEurope (Multi-CSC)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
EUYEurope (Multi-CSC)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
EVRUnited Kingdom (EE)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
MEOPortugal (MEO)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
MOBAustria (A1)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
MOTSlovenia (Telekom)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
MSRSerbiaAug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
O2CCzech Republic (O2)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
PLSPoland (Plus)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
PRTPoland (Play)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
SFRFrance (SFR)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
SIMSlovenia (A1)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
SWCSwitzerlandAug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
TOPSerbia/MontenegroAug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
VIPCroatia (A1)Aug 30, 2026day 0S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
INSIndiaAug 31, 2026+1 dayS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
NPBNepalAug 31, 2026+1 dayS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
SLKSri LankaAug 31, 2026+1 dayS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
BVOBoliviaAug 31, 2026+1 dayS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
COOColombiaAug 31, 2026+1 dayS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
GLONigeria (Glo)Aug 31, 2026+1 dayS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
GTOGuatemalaAug 31, 2026+1 dayS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
TPAPanamaAug 31, 2026+1 dayS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
UPOUruguayAug 31, 2026+1 dayS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
UYOUruguayAug 31, 2026+1 dayS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
AROArgentinaAug 31, 2026+1 dayS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
ZTOBrazilAug 31, 2026+1 dayS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
CHOChileSep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
CDRDominican RepublicSep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
CGUGuatemala (Claro)Sep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
CHEChile (Entel)Sep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
CHLChile (Claro)Sep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
CHTChile (Movistar)Sep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
CHXChileSep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
COBColombia (Movistar)Sep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
COLColombiaSep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
COMColombia (Claro)Sep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
CRCCosta RicaSep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
CTIArgentina (Claro)Sep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
DORDominican RepublicSep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
PGUGuatemalaSep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
PSNArgentina (Personal)Sep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
TGPParaguaySep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
UFNArgentina (Movistar)Sep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
ZTABrazil (Claro)Sep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
ZTMBrazil (TIM)Sep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
ZVVBrazil (Vivo)Sep 1, 2026+2 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
CAUCaucasusSep 3, 2026+4 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
SERRussiaSep 3, 2026+4 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
SKZKazakhstanSep 3, 2026+4 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
EBEEcuadorSep 3, 2026+4 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
ECOEcuadorSep 3, 2026+4 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
IUSMexico (AT&T)Sep 3, 2026+4 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
MXOMexicoSep 3, 2026+4 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
PEOPeruSep 3, 2026+4 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
PETPeru (Movistar)Sep 3, 2026+4 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
PNTPanamaSep 3, 2026+4 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
SAMOceaniaSep 3, 2026+4 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
TCEMexico (Telcel)Sep 3, 2026+4 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
TMMMyanmarSep 3, 2026+4 daysS921BXXSHDZH3/S921BOWOHDZH3/S921BXXSHDZH3
ACRGhanaSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
AFGAfghanistanSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
AFRAfricaSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
DKRSenegalSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
ECTNigeriaSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
EGYEgyptSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
GLBPhilippines (Globe)Sep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
ILOIsraelSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
KSASaudi ArabiaSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
LYSLibyaSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
MIDMiddle EastSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
XIDIndonesiaSep 7, 2026+8 daysS921BXXSHDZH3/S921BOLEHDZH3/S921BXXSHDZH3
MM1Singapore (M1)Sep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
MWDMoroccoSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
OPSAustralia (Optus)Sep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
PAKPakistanSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
PKDPakistanSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
SINSingapore (Singtel)Sep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
STHSingapore (StarHub)Sep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
TELAustralia (Telstra)Sep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
THLThailandSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
TUNTunisiaSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
TURTurkeySep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
VAUAustralia (Vodafone)Sep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
XFASouth AfricaSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
XFESouth AfricaSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
XFVSouth Africa (Vodacom)Sep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
XMEMalaysiaSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
XNZNew ZealandSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
XSAAustraliaSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
XSGUnited Arab EmiratesSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
XSPSingaporeSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
XTCPhilippinesSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3
XXVVietnamSep 7, 2026+8 daysS921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3

Download and release notes

samloader download -m SM-S921B -r EUX -v S921BXXSHDZH3/S921BOXMHDZH3/S921BXXSHDZH3

Samsung's release notes and security patch level for this update: SM-S921B / EUX on doc.samsungmobile.com. What each part of the build number means: decode S921BXXSHDZH3.