S918U1UES8FZI1 – Galaxy S23 Ultra firmware

Build S918U1UES8FZI1 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 27, 2026 (method) and has reached 14 regions so far. It keeps bootloader bit 8, so downgrading to the previous build S918U1UES8FZH3 is still possible. Samsung still serves this file.

Model
SM-S918U1
Android
Android 16
Type
Security
Bootloader bit
8
First released
Sep 27, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received S918U1UES8FZI1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Sep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
AIOUSA (Cricket)Sep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
ATTUSA (AT&T)Sep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
CCTUSA (Comcast)Sep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
DSAUSASep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
DSHUSASep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
LRAUSA (Bluegrass)Sep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
TFNUSA (TracFone)Sep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
TMBUSA (T-Mobile)Sep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
TMKUSA (MetroPCS)Sep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
USCUSA (US Cellular)Sep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
VZWUSA (Verizon)Sep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
XAAUSA (unlocked)Sep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1
XARUSA (Cellular South)Sep 27, 2026day 0S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1

Download and release notes

samloader download -m SM-S918U1 -r XAA -v S918U1UES8FZI1/S918U1OYM8FZI1/S918U1UES8FZI1

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 S918U1UES8FZI1.