F966U1UEUCCZIH – Galaxy Z Fold7 firmware

Build F966U1UEUCCZIH is a feature update for the Galaxy Z Fold7 (SM-F966U1) on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 5, 2026 (method) and has reached 14 regions so far. It keeps bootloader bit 12, so downgrading to the previous build F966U1UESCBZH3 is still possible. Samsung still serves this file.

Model
SM-F966U1
Android
Android 17
Type
Feature
Bootloader bit
12
First released
Oct 5, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received F966U1UEUCCZIH, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ATTUSA (AT&T)Oct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
TMBUSA (T-Mobile)Oct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
TMKUSA (MetroPCS)Oct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
USCUSA (US Cellular)Oct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
VZWUSA (Verizon)Oct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
XAAUSA (unlocked)Oct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
XARUSA (Cellular South)Oct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
ACGUSA (C Spire)Oct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
AIOUSA (Cricket)Oct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
CCTUSA (Comcast)Oct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
LRAUSA (Bluegrass)Oct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
TFNUSA (TracFone)Oct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
DSAUSAOct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH
DSHUSAOct 5, 2026day 0F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH

Download and release notes

samloader download -m SM-F966U1 -r XAA -v F966U1UEUCCZIH/F966U1OYMCCZIH/F966U1UEUCCZIH

Samsung's release notes and security patch level for this update: SM-F966U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode F966U1UEUCCZIH.