S921U1UES6DZF2 – Galaxy S24 firmware

Build S921U1UES6DZF2 is a security update for the Galaxy S24 (SM-S921U1) on Android 16 (One UI 8). It first appeared on Samsung's servers on Jun 24, 2026 (method) and has reached 14 regions so far. It keeps bootloader bit 6, so downgrading to the previous build S921U1UES6DZE2 is still possible. Samsung still serves this file.

Model
SM-S921U1
Android
Android 16
Type
Security
Bootloader bit
6
First released
Jun 24, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received S921U1UES6DZF2, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Jun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
AIOUSA (Cricket)Jun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
ATTUSA (AT&T)Jun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
CCTUSA (Comcast)Jun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
DSAUSAJun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
DSHUSAJun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
LRAUSA (Bluegrass)Jun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
TFNUSA (TracFone)Jun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
TMBUSA (T-Mobile)Jun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
TMKUSA (MetroPCS)Jun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
USCUSA (US Cellular)Jun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
VZWUSA (Verizon)Jun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
XAAUSA (unlocked)Jun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2
XARUSA (Cellular South)Jun 24, 2026day 0S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2

Download and release notes

samloader download -m SM-S921U1 -r XAA -v S921U1UES6DZF2/S921U1OYM6DZF2/S921U1UES6DZF2

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 S921U1UES6DZF2.