F966USQSDCZJ1 – Galaxy Z Fold7 firmware

Build F966USQSDCZJ1 is a security update for the Galaxy Z Fold7 (SM-F966U) on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 21, 2026 (method) and has reached 7 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 F966USQUCCZIH is blocked. Samsung still serves this file.

Model
SM-F966U
Android
Android 17
Type
Security
Bootloader bit
13
First released
Oct 21, 2026
Regions
7

Rollout timeline by region

The date each region code (CSC) first received F966USQSDCZJ1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
XAAUSA (unlocked)Oct 21, 2026day 0F966USQSDCZJ1/F966UOYNDCZJ1/F966USQSDCZJ1
VZWUSA (Verizon)Oct 21, 2026day 0F966USQSDCZJ1/F966UOYNDCZJ1/F966USQSDCZJ1
ATTUSA (AT&T)Oct 21, 2026day 0F966USQSDCZJ1/F966UOYNDCZJ1/F966USQSDCZJ1
CCTUSA (Comcast)Oct 25, 2026+4 daysF966USQSDCZJ1/F966UOYNDCZJ1/F966USQSDCZJ1
TMBUSA (T-Mobile)Nov 4, 2026+14 daysF966USQSDCZJ1/F966UOYNDCZJ1/F966USQSDCZJ1
TMKUSA (MetroPCS)Nov 4, 2026+14 daysF966USQSDCZJ1/F966UOYNDCZJ1/F966USQSDCZJ1
USCUSA (US Cellular)Nov 4, 2026+14 daysF966USQSDCZJ1/F966UOYNDCZJ1/F966USQSDCZJ1

Download and release notes

samloader download -m SM-F966U -r XAA -v F966USQSDCZJ1/F966UOYNDCZJ1/F966USQSDCZJ1

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 F966USQSDCZJ1.