S938U1UESBCZF5 – Galaxy S25 Ultra firmware

Build S938U1UESBCZF5 is a security update for the Galaxy S25 Ultra (SM-S938U1) on Android 16 (One UI 8). It first appeared on Samsung's servers on Jul 15, 2026 (method) and has reached 14 regions so far. It raises the bootloader bit from 10 to 11: once installed, the device no longer accepts firmware with bit 10 or lower, so a downgrade to S938U1UEUACZF1 is blocked. Samsung still serves this file.

Model
SM-S938U1
Android
Android 16
Type
Security
Bootloader bit
11
First released
Jul 15, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received S938U1UESBCZF5, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
TMKUSA (MetroPCS)Jul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
USCUSA (US Cellular)Jul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
VZWUSA (Verizon)Jul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
XAAUSA (unlocked)Jul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
XARUSA (Cellular South)Jul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
ACGUSA (C Spire)Jul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
AIOUSA (Cricket)Jul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
ATTUSA (AT&T)Jul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
CCTUSA (Comcast)Jul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
DSAUSAJul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
DSHUSAJul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
LRAUSA (Bluegrass)Jul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
TFNUSA (TracFone)Jul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5
TMBUSA (T-Mobile)Jul 15, 2026day 0S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5

Download and release notes

samloader download -m SM-S938U1 -r XAA -v S938U1UESBCZF5/S938U1OYMBCZF5/S938U1UESBCZF5

Samsung's release notes and security patch level for this update: SM-S938U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode S938U1UESBCZF5.