S921U1UEU6EZIF – Galaxy S24 firmware

Build S921U1UEU6EZIF is a feature update for the Galaxy S24 (SM-S921U1) on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 20, 2026 (method) and has reached 14 regions so far. It keeps bootloader bit 6, so downgrading to the previous build S921U1UES6DZI2 is still possible. Samsung still serves this file.

Model
SM-S921U1
Android
Android 17
Type
Feature
Bootloader bit
6
First released
Oct 20, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received S921U1UEU6EZIF, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Oct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
AIOUSA (Cricket)Oct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
ATTUSA (AT&T)Oct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
CCTUSA (Comcast)Oct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
DSAUSAOct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
DSHUSAOct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
LRAUSA (Bluegrass)Oct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
TFNUSA (TracFone)Oct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
TMBUSA (T-Mobile)Oct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
TMKUSA (MetroPCS)Oct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
USCUSA (US Cellular)Oct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
VZWUSA (Verizon)Oct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
XAAUSA (unlocked)Oct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF
XARUSA (Cellular South)Oct 20, 2026day 0S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF

Download and release notes

samloader download -m SM-S921U1 -r XAA -v S921U1UEU6EZIF/S921U1OYM6EZIF/S921U1UEU6EZIF

Samsung's release notes and security patch level for this update: SM-S921U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode S921U1UEU6EZIF.