S918BXXSAFZE1 – Galaxy S23 Ultra firmware

Build S918BXXSAFZE1 is a security update for the Galaxy S23 Ultra (SM-S918B) on Android 16 (One UI 8). It first appeared on Samsung's servers on May 27, 2026 (method) and has reached 98 regions so far. It raises the bootloader bit from 9 to 10: once installed, the device no longer accepts firmware with bit 9 or lower, so a downgrade to S918BXXU9FZDP is blocked. Samsung still serves this file.

Model
SM-S918B
Android
Android 16
Type
Security
Bootloader bit
10
First released
May 27, 2026
Regions
98

Rollout timeline by region

The date each region code (CSC) first received S918BXXSAFZE1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
GLBPhilippines (Globe)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
THLThailandMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
XMEMalaysiaMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
XNZNew ZealandMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
XTCPhilippinesMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
XXVVietnamMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
CAUCaucasusMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
OPSAustralia (Optus)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
SEKUkraineMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
SERRussiaMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
SKZKazakhstanMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
TELAustralia (Telstra)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
VAUAustralia (Vodafone)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
XSAAustraliaMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
BOGFrance (Bouygues)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
BTBUnited Kingdom (BT)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
EUXEurope (Multi-CSC)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
EUYEurope (Multi-CSC)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
EVRUnited Kingdom (EE)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
MEOPortugal (MEO)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
MOTSlovenia (Telekom)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
MSRSerbiaMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
O2CCzech Republic (O2)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
PLSPoland (Plus)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
PRTPoland (Play)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
SFRFrance (SFR)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
SIMSlovenia (A1)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
SWCSwitzerlandMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
TIMItaly (TIM)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
TOPSerbia/MontenegroMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
VIPCroatia (A1)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
MOBAustria (A1)May 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
ILOIsraelMay 27, 2026day 0S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
BKDBangladeshMay 28, 2026+1 dayS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
INSIndiaMay 28, 2026+1 dayS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
SLKSri LankaMay 28, 2026+1 dayS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
ACRGhanaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
AFGAfghanistanMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
AFRAfricaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
DKRSenegalMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
ECTNigeriaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
EGYEgyptMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
KSASaudi ArabiaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
LYSLibyaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
MIDMiddle EastMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
MM1Singapore (M1)May 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
MWDMoroccoMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
PKDPakistanMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
SINSingapore (Singtel)May 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
STHSingapore (StarHub)May 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
TUNTunisiaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
TURTurkeyMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
XFASouth AfricaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
XFESouth AfricaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
XFVSouth Africa (Vodacom)May 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
XSGUnited Arab EmiratesMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
XSPSingaporeMay 31, 2026+4 daysS918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1
XIDIndonesiaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOLEAFZE1/S918BXXSAFZE1
AROArgentinaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
BVOBoliviaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
CDRDominican RepublicMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
COBColombia (Movistar)May 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
COLColombiaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
COMColombia (Claro)May 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
COOColombiaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
CTIArgentina (Claro)May 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
GTOGuatemalaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
IUSMexico (AT&T)May 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
MXOMexicoMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
PSNArgentina (Personal)May 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
TCEMexico (Telcel)May 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
TGPParaguayMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
TMMMyanmarMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
TPAPanamaMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
UFNArgentina (Movistar)May 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
UPOUruguayMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
UYOUruguayMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
ZTABrazil (Claro)May 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
ZTMBrazil (TIM)May 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
ZTOBrazilMay 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
ZVVBrazil (Vivo)May 31, 2026+4 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
PEOPeruJun 2, 2026+6 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
PETPeru (Movistar)Jun 2, 2026+6 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
PNTPanamaJun 2, 2026+6 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
SAMOceaniaJun 2, 2026+6 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
EBEEcuadorJun 11, 2026+15 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
ECOEcuadorJun 11, 2026+15 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
CGUGuatemala (Claro)Jun 17, 2026+21 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
CRCCosta RicaJun 17, 2026+21 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
DORDominican RepublicJun 17, 2026+21 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
GLONigeria (Glo)Jun 17, 2026+21 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
NBSLatin America (open market)Jun 17, 2026+21 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
PGUGuatemalaJun 17, 2026+21 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
CHEChile (Entel)Jun 23, 2026+27 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
CHLChile (Claro)Jun 23, 2026+27 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
CHOChileJun 23, 2026+27 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
CHTChile (Movistar)Jun 23, 2026+27 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1
CHXChileJun 23, 2026+27 daysS918BXXSAFZE1/S918BOWOAFZE1/S918BXXSAFZE1

Download and release notes

samloader download -m SM-S918B -r EUX -v S918BXXSAFZE1/S918BOXMAFZE1/S918BXXSAFZE1

Samsung's release notes and security patch level for this update: SM-S918B / EUX on doc.samsungmobile.com. What each part of the build number means: decode S918BXXSAFZE1.