F971BXXU3AZI5 – Galaxy Z Fold8 firmware

Build F971BXXU3AZI5 is a feature update for the Galaxy Z Fold8 (SM-F971B) on Android 17 (One UI 9). It first appeared on Samsung's servers on Sep 20, 2026 (method) and has reached 42 regions so far. It raises the bootloader bit from 2 to 3: once installed, the device no longer accepts firmware with bit 2 or lower, so a downgrade to F971BXXS2AZH7 is blocked. Samsung still serves this file.

Model
SM-F971B
Android
Android 17
Type
Feature
Bootloader bit
3
First released
Sep 20, 2026
Regions
42

Rollout timeline by region

The date each region code (CSC) first received F971BXXU3AZI5, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
INSIndiaSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
XSPSingaporeSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
XTCPhilippinesSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
XXVVietnamSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
ACRGhanaSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
DKRSenegalSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
ECTNigeriaSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
GLBPhilippines (Globe)Sep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
GTOGuatemalaSep 20, 2026day 0F971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5
KSASaudi ArabiaSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
MM1Singapore (M1)Sep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
MXOMexicoSep 20, 2026day 0F971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5
SINSingapore (Singtel)Sep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
STHSingapore (StarHub)Sep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
TCEMexico (Telcel)Sep 20, 2026day 0F971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5
THLThailandSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
XFASouth AfricaSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
XFVSouth Africa (Vodacom)Sep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
XIDIndonesiaSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
XMEMalaysiaSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
XNZNew ZealandSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
XSGUnited Arab EmiratesSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
CAUCaucasusSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
EUXEurope (Multi-CSC)Sep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
EUYEurope (Multi-CSC)Sep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
ILOIsraelSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
PLSPoland (Plus)Sep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
PRTPoland (Play)Sep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
SEKUkraineSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
SKZKazakhstanSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
TURTurkeySep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
XSAAustraliaSep 20, 2026day 0F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5
ZVVBrazil (Vivo)Sep 21, 2026+1 dayF971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5
CDRDominican RepublicSep 21, 2026+1 dayF971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5
CGUGuatemala (Claro)Sep 21, 2026+1 dayF971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5
DORDominican RepublicSep 21, 2026+1 dayF971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5
ECOEcuadorSep 21, 2026+1 dayF971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5
GLONigeria (Glo)Sep 21, 2026+1 dayF971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5
PGUGuatemalaSep 21, 2026+1 dayF971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5
ZTABrazil (Claro)Sep 21, 2026+1 dayF971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5
ZTMBrazil (TIM)Sep 21, 2026+1 dayF971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5
ZTOBrazilSep 21, 2026+1 dayF971BXXU3AZI5/F971BOWO3AZI5/F971BXXU3AZI5

Download and release notes

samloader download -m SM-F971B -r EUX -v F971BXXU3AZI5/F971BOXM3AZI5/F971BXXU3AZI5

Samsung's release notes and security patch level for this update: SM-F971B / EUX on doc.samsungmobile.com. What each part of the build number means: decode F971BXXU3AZI5.