S938U1UEUCDZIF – Galaxy S25 Ultra firmware

Build S938U1UEUCDZIF is a feature update for the Galaxy S25 Ultra (SM-S938U1) 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 S938U1UESCCZF9 is still possible. Samsung still serves this file.

Model
SM-S938U1
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 S938U1UEUCDZIF, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Oct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
AIOUSA (Cricket)Oct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
ATTUSA (AT&T)Oct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
CCTUSA (Comcast)Oct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
DSAUSAOct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
DSHUSAOct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
LRAUSA (Bluegrass)Oct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
TFNUSA (TracFone)Oct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
TMBUSA (T-Mobile)Oct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
TMKUSA (MetroPCS)Oct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
USCUSA (US Cellular)Oct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
VZWUSA (Verizon)Oct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
XAAUSA (unlocked)Oct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF
XARUSA (Cellular South)Oct 5, 2026day 0S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF

Download and release notes

samloader download -m SM-S938U1 -r XAA -v S938U1UEUCDZIF/S938U1OYMCDZIF/S938U1UEUCDZIF

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 S938U1UEUCDZIF.