S921USQS6DZH3 – Galaxy S24 firmware

Build S921USQS6DZH3 is a security update for the Galaxy S24 (SM-S921U) on Android 16 (One UI 8). It first appeared on Samsung's servers on Aug 31, 2026 (method) and has reached 10 regions so far. It keeps bootloader bit 6, so downgrading to the previous build S921USQS6DZG1 is still possible. Samsung still serves this file.

Model
SM-S921U
Android
Android 16
Type
Security
Bootloader bit
6
First released
Aug 31, 2026
Regions
10

Rollout timeline by region

The date each region code (CSC) first received S921USQS6DZH3, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ATTUSA (AT&T)Aug 31, 2026day 0S921USQS6DZH3/S921UOYN6DZH3/S921USQS6DZH3
CCTUSA (Comcast)Aug 31, 2026day 0S921USQS6DZH3/S921UOYN6DZH3/S921USQS6DZH3
TMBUSA (T-Mobile)Aug 31, 2026day 0S921USQS6DZH3/S921UOYN6DZH3/S921USQS6DZH3
TMKUSA (MetroPCS)Aug 31, 2026day 0S921USQS6DZH3/S921UOYN6DZH3/S921USQS6DZH3
USCUSA (US Cellular)Aug 31, 2026day 0S921USQS6DZH3/S921UOYN6DZH3/S921USQS6DZH3
VZWUSA (Verizon)Aug 31, 2026day 0S921USQS6DZH3/S921UOYN6DZH3/S921USQS6DZH3
AIOUSA (Cricket)Aug 31, 2026day 0S921USQS6DZH3/S921UOYN6DZH3/S921USQS6DZH3
DSAUSASep 1, 2026+1 dayS921USQS6DZH3/S921UOYN6DZH3/S921USQS6DZH3
DSHUSASep 1, 2026+1 dayS921USQS6DZH3/S921UOYN6DZH3/S921USQS6DZH3
XAAUSA (unlocked)Sep 1, 2026+1 dayS921USQS6DZH3/S921UOYN6DZH3/S921USQS6DZH3

Download and release notes

samloader download -m SM-S921U -r XAA -v S921USQS6DZH3/S921UOYN6DZH3/S921USQS6DZH3

Samsung's release notes and security patch level for this update: SM-S921U / XAA on doc.samsungmobile.com. What each part of the build number means: decode S921USQS6DZH3.