S918U1UEU8GZIF – Galaxy S23 Ultra firmware

Build S918U1UEU8GZIF is a feature update for the Galaxy S23 Ultra (SM-S918U1) on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 25, 2026 (method) and has reached 14 regions so far. It keeps bootloader bit 8, so downgrading to the previous build S918U1UES8FZI1 is still possible. Samsung still serves this file.

Model
SM-S918U1
Android
Android 17
Type
Feature
Bootloader bit
8
First released
Oct 25, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received S918U1UEU8GZIF, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Oct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
AIOUSA (Cricket)Oct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
ATTUSA (AT&T)Oct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
CCTUSA (Comcast)Oct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
DSAUSAOct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
DSHUSAOct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
LRAUSA (Bluegrass)Oct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
TFNUSA (TracFone)Oct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
TMBUSA (T-Mobile)Oct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
TMKUSA (MetroPCS)Oct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
USCUSA (US Cellular)Oct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
VZWUSA (Verizon)Oct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
XAAUSA (unlocked)Oct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF
XARUSA (Cellular South)Oct 25, 2026day 0S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF

Download and release notes

samloader download -m SM-S918U1 -r XAA -v S918U1UEU8GZIF/S918U1OYM8GZIF/S918U1UEU8GZIF

Samsung's release notes and security patch level for this update: SM-S918U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode S918U1UEU8GZIF.