F966BXXSDCZJ1 – Galaxy Z Fold7 firmware

Build F966BXXSDCZJ1 is a security update for the Galaxy Z Fold7 (SM-F966B) on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 18, 2026 (method) and has reached 67 regions so far. It raises the bootloader bit from 12 to 13: once installed, the device no longer accepts firmware with bit 12 or lower, so a downgrade to F966BXXUCCZIH is blocked. Samsung still serves this file.

Model
SM-F966B
Android
Android 17
Type
Security
Bootloader bit
13
First released
Oct 18, 2026
Regions
67

Rollout timeline by region

The date each region code (CSC) first received F966BXXSDCZJ1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
XXVVietnamOct 18, 2026day 0F966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
ACRGhanaOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
AFRAfricaOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
CAUCaucasusOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
DKRSenegalOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
ECTNigeriaOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
GLBPhilippines (Globe)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
ILOIsraelOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
INSIndiaOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
KSASaudi ArabiaOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
MIDMiddle EastOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
MM1Singapore (M1)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
SEKUkraineOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
SINSingapore (Singtel)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
SKZKazakhstanOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
STHSingapore (StarHub)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
THLThailandOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
TURTurkeyOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
XFASouth AfricaOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
XFVSouth Africa (Vodacom)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
XIDIndonesiaOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
XMEMalaysiaOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
XNZNew ZealandOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
XSAAustraliaOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
XSGUnited Arab EmiratesOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
XSPSingaporeOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
XTCPhilippinesOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
BOGFrance (Bouygues)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
EUXEurope (Multi-CSC)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
EUYEurope (Multi-CSC)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
MEOPortugal (MEO)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
MOBAustria (A1)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
MOTSlovenia (Telekom)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
MSRSerbiaOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
PLSPoland (Plus)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
PRTPoland (Play)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
SFRFrance (SFR)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
SIMSlovenia (A1)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
SWCSwitzerlandOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
TOPSerbia/MontenegroOct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
VIPCroatia (A1)Oct 21, 2026+3 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
COOColombiaOct 22, 2026+4 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
EBEEcuadorOct 22, 2026+4 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
ECOEcuadorOct 22, 2026+4 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
GTOGuatemalaOct 22, 2026+4 daysF966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1
MXOMexicoOct 22, 2026+4 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
TCEMexico (Telcel)Oct 22, 2026+4 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
UYOUruguayOct 22, 2026+4 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
ZTABrazil (Claro)Oct 22, 2026+4 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
ZTMBrazil (TIM)Oct 22, 2026+4 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
ZTOBrazilOct 22, 2026+4 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
ZVVBrazil (Vivo)Oct 22, 2026+4 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
AROArgentinaOct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
CDRDominican RepublicOct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
CGUGuatemala (Claro)Oct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
CHOChileOct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
CRCCosta RicaOct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
CTIArgentina (Claro)Oct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
DORDominican RepublicOct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
GLONigeria (Glo)Oct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
PEOPeruOct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
PETPeru (Movistar)Oct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
PGUGuatemalaOct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
PSNArgentina (Personal)Oct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
TGPParaguayOct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
UFNArgentina (Movistar)Oct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1
UPOUruguayOct 28, 2026+10 daysF966BXXSDCZJ1/F966BOWODCZJ1/F966BXXSDCZJ1

Download and release notes

samloader download -m SM-F966B -r EUX -v F966BXXSDCZJ1/F966BOXMDCZJ1/F966BXXSDCZJ1

Samsung's release notes and security patch level for this update: SM-F966B / EUX on doc.samsungmobile.com. What each part of the build number means: decode F966BXXSDCZJ1.