F766U1UESDCZJ1 – Galaxy Z Flip7 firmware

Build F766U1UESDCZJ1 is a security update for the Galaxy Z Flip7 (SM-F766U1) on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 21, 2026 (method) and has reached 14 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 F766U1UEUCCZIH is blocked. Samsung still serves this file.

Model
SM-F766U1
Android
Android 17
Type
Security
Bootloader bit
13
First released
Oct 21, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received F766U1UESDCZJ1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
LRAUSA (Bluegrass)Oct 21, 2026day 0F766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
TFNUSA (TracFone)Oct 21, 2026day 0F766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
VZWUSA (Verizon)Oct 21, 2026day 0F766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
XARUSA (Cellular South)Oct 21, 2026day 0F766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
ACGUSA (C Spire)Oct 21, 2026day 0F766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
AIOUSA (Cricket)Oct 21, 2026day 0F766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
ATTUSA (AT&T)Oct 21, 2026day 0F766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
CCTUSA (Comcast)Oct 21, 2026day 0F766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
DSAUSANov 4, 2026+14 daysF766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
DSHUSANov 4, 2026+14 daysF766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
TMBUSA (T-Mobile)Nov 4, 2026+14 daysF766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
TMKUSA (MetroPCS)Nov 4, 2026+14 daysF766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
USCUSA (US Cellular)Nov 4, 2026+14 daysF766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1
XAAUSA (unlocked)Nov 4, 2026+14 daysF766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1

Download and release notes

samloader download -m SM-F766U1 -r XAA -v F766U1UESDCZJ1/F766U1OYMDCZJ1/F766U1UESDCZJ1

Samsung's release notes and security patch level for this update: SM-F766U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode F766U1UESDCZJ1.