S918U1UES8FZG1 – Galaxy S23 Ultra firmware

Build S918U1UES8FZG1 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 Aug 2, 2026 (method) and has reached 14 regions so far. It keeps bootloader bit 8, so downgrading to the previous build S918U1UES8FZF5 is still possible. Samsung still serves this file.

Model
SM-S918U1
Android
Android 16
Type
Security
Bootloader bit
8
First released
Aug 2, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received S918U1UES8FZG1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Aug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
AIOUSA (Cricket)Aug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
ATTUSA (AT&T)Aug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
CCTUSA (Comcast)Aug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
DSAUSAAug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
DSHUSAAug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
LRAUSA (Bluegrass)Aug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
TFNUSA (TracFone)Aug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
TMBUSA (T-Mobile)Aug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
TMKUSA (MetroPCS)Aug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
USCUSA (US Cellular)Aug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
VZWUSA (Verizon)Aug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
XAAUSA (unlocked)Aug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1
XARUSA (Cellular South)Aug 2, 2026day 0S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1

Download and release notes

samloader download -m SM-S918U1 -r XAA -v S918U1UES8FZG1/S918U1OYM8FZG1/S918U1UES8FZG1

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 S918U1UES8FZG1.