S918U1UES8FZH3 – Galaxy S23 Ultra firmware

Build S918U1UES8FZH3 is a security update for the Galaxy S23 Ultra (SM-S918U1) on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 1, 2026 (method) and has reached 14 regions so far. It keeps bootloader bit 8, so downgrading to the previous build S918U1UES8FZG1 is still possible. Samsung still serves this file.

Model
SM-S918U1
Android
Android 16
Type
Security
Bootloader bit
8
First released
Sep 1, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received S918U1UES8FZH3, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Sep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
AIOUSA (Cricket)Sep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
ATTUSA (AT&T)Sep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
CCTUSA (Comcast)Sep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
DSAUSASep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
DSHUSASep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
LRAUSA (Bluegrass)Sep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
TFNUSA (TracFone)Sep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
TMBUSA (T-Mobile)Sep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
TMKUSA (MetroPCS)Sep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
USCUSA (US Cellular)Sep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
VZWUSA (Verizon)Sep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
XAAUSA (unlocked)Sep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3
XARUSA (Cellular South)Sep 1, 2026day 0S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3

Download and release notes

samloader download -m SM-S918U1 -r XAA -v S918U1UES8FZH3/S918U1OYM8FZH3/S918U1UES8FZH3

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 S918U1UES8FZH3.