S921USQS6EZJ1 – Galaxy S24 firmware
Build S921USQS6EZJ1 is a security update for the Galaxy S24 (SM-S921U)
on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 26, 2026 (method) and has reached
6 regions so far. It keeps bootloader bit 6, so downgrading to the previous build S921USQU6EZIF is still possible. Samsung still serves this file.
- Model
- SM-S921U
- Android
- Android 17
- Type
- Security
- Bootloader bit
- 6
- First released
- Oct 26, 2026
- Regions
- 6
Rollout timeline by region
The date each region code (CSC) first received S921USQS6EZJ1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
AIO | USA (Cricket) | Oct 26, 2026 | day 0 | S921USQS6EZJ1/S921UOYN6EZJ1/S921USQS6EZJ1 |
ATT | USA (AT&T) | Oct 26, 2026 | day 0 | S921USQS6EZJ1/S921UOYN6EZJ1/S921USQS6EZJ1 |
CCT | USA (Comcast) | Oct 29, 2026 | +3 days | S921USQS6EZJ1/S921UOYN6EZJ1/S921USQS6EZJ1 |
VZW | USA (Verizon) | Oct 29, 2026 | +3 days | S921USQS6EZJ1/S921UOYN6EZJ1/S921USQS6EZJ1 |
XAA | USA (unlocked) | Oct 29, 2026 | +3 days | S921USQS6EZJ1/S921UOYN6EZJ1/S921USQS6EZJ1 |
TMB | USA (T-Mobile) | Nov 10, 2026 | +15 days | S921USQS6EZJ1/S921UOYN6EZJ1/S921USQS6EZJ1 |
Download and release notes
samloader download -m SM-S921U -r XAA -v S921USQS6EZJ1/S921UOYN6EZJ1/S921USQS6EZJ1Samsung'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 S921USQS6EZJ1.