S921U1UES6DZG1 – Galaxy S24 firmware

Build S921U1UES6DZG1 is a security update for the Galaxy S24 (SM-S921U1) on Android 16 (One UI 8). It first appeared on Samsung's servers on Jul 22, 2026 (method) and has reached 14 regions so far. It keeps bootloader bit 6, so downgrading to the previous build S921U1UES6DZF2 is still possible. Samsung still serves this file.

Model
SM-S921U1
Android
Android 16
Type
Security
Bootloader bit
6
First released
Jul 22, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received S921U1UES6DZG1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Jul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
AIOUSA (Cricket)Jul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
ATTUSA (AT&T)Jul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
CCTUSA (Comcast)Jul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
DSAUSAJul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
DSHUSAJul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
LRAUSA (Bluegrass)Jul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
TFNUSA (TracFone)Jul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
TMBUSA (T-Mobile)Jul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
TMKUSA (MetroPCS)Jul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
USCUSA (US Cellular)Jul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
VZWUSA (Verizon)Jul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
XAAUSA (unlocked)Jul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1
XARUSA (Cellular South)Jul 22, 2026day 0S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1

Download and release notes

samloader download -m SM-S921U1 -r XAA -v S921U1UES6DZG1/S921U1OYM6DZG1/S921U1UES6DZG1

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 S921U1UES6DZG1.