F966USQUDCZJB – Galaxy Z Fold7 firmware

Build F966USQUDCZJB is a feature update for the Galaxy Z Fold7 (SM-F966U) on Android 17 (One UI 9). It first appeared on Samsung's servers on Nov 4, 2026 (method) and has reached 7 regions so far. It keeps bootloader bit 13, so downgrading to the previous build F966USQSDCZJ1 is still possible. Samsung still serves this file.

Model
SM-F966U
Android
Android 17
Type
Feature
Bootloader bit
13
First released
Nov 4, 2026
Regions
7

Rollout timeline by region

The date each region code (CSC) first received F966USQUDCZJB, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
VZWUSA (Verizon)Nov 4, 2026day 0F966USQUDCZJB/F966UOYNDCZJB/F966USQUDCZJB
TMKUSA (MetroPCS)Nov 4, 2026day 0F966USQUDCZJB/F966UOYNDCZJB/F966USQUDCZJB
ATTUSA (AT&T)Nov 4, 2026day 0F966USQUDCZJB/F966UOYNDCZJB/F966USQUDCZJB
CCTUSA (Comcast)Nov 4, 2026day 0F966USQUDCZJB/F966UOYNDCZJB/F966USQUDCZJB
TMBUSA (T-Mobile)Nov 4, 2026day 0F966USQUDCZJB/F966UOYNDCZJB/F966USQUDCZJB
USCUSA (US Cellular)Nov 4, 2026day 0F966USQUDCZJB/F966UOYNDCZJB/F966USQUDCZJB
XAAUSA (unlocked)Nov 4, 2026day 0F966USQUDCZJB/F966UOYNDCZJB/F966USQUDCZJB

Download and release notes

samloader download -m SM-F966U -r XAA -v F966USQUDCZJB/F966UOYNDCZJB/F966USQUDCZJB

Samsung's release notes and security patch level for this update: SM-F966U / XAA on doc.samsungmobile.com. What each part of the build number means: decode F966USQUDCZJB.