S921USQS6DZI1 – Galaxy S24 firmware
Build S921USQS6DZI1 is a security update for the Galaxy S24 (SM-S921U)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 29, 2026 (method) and has reached
10 regions so far. It keeps bootloader bit 6, so downgrading to the previous build S921USQS6DZH3 is still possible. Samsung still serves this file.
- Model
- SM-S921U
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 6
- First released
- Sep 29, 2026
- Regions
- 10
Rollout timeline by region
The date each region code (CSC) first received S921USQS6DZI1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
AIO | USA (Cricket) | Sep 29, 2026 | day 0 | S921USQS6DZI1/S921UOYN6DZI1/S921USQS6DZI1 |
ATT | USA (AT&T) | Sep 29, 2026 | day 0 | S921USQS6DZI1/S921UOYN6DZI1/S921USQS6DZI1 |
DSA | USA | Sep 30, 2026 | +1 day | S921USQS6DZI1/S921UOYN6DZI1/S921USQS6DZI1 |
DSH | USA | Sep 30, 2026 | +1 day | S921USQS6DZI1/S921UOYN6DZI1/S921USQS6DZI1 |
CCT | USA (Comcast) | Sep 30, 2026 | +1 day | S921USQS6DZI1/S921UOYN6DZI1/S921USQS6DZI1 |
VZW | USA (Verizon) | Sep 30, 2026 | +1 day | S921USQS6DZI1/S921UOYN6DZI1/S921USQS6DZI1 |
XAA | USA (unlocked) | Sep 30, 2026 | +1 day | S921USQS6DZI1/S921UOYN6DZI1/S921USQS6DZI1 |
USC | USA (US Cellular) | Oct 1, 2026 | +2 days | S921USQS6DZI1/S921UOYN6DZI1/S921USQS6DZI1 |
TMB | USA (T-Mobile) | Oct 1, 2026 | +2 days | S921USQS6DZI1/S921UOYN6DZI1/S921USQS6DZI1 |
TMK | USA (MetroPCS) | Oct 1, 2026 | +2 days | S921USQS6DZI1/S921UOYN6DZI1/S921USQS6DZI1 |
Download and release notes
samloader download -m SM-S921U -r XAA -v S921USQS6DZI1/S921UOYN6DZI1/S921USQS6DZI1Samsung'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 S921USQS6DZI1.