S921EXXS3CZI1 – Galaxy S24 firmware
Build S921EXXS3CZI1 is a security update for the Galaxy S24 (SM-S921E)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 30, 2026 (method) and has reached
1 region so far. It keeps bootloader bit 3, so downgrading to the previous build S921EXXS3CZH2 is still possible. Samsung still serves this file.
- Model
- SM-S921E
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 3
- First released
- Sep 30, 2026
- Regions
- 1
Rollout timeline by region
The date each region code (CSC) first received S921EXXS3CZI1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
INS | India | Sep 30, 2026 | day 0 | S921EXXS3CZI1/S921EOXM3CZI1/S921EXXS3CZI1 |
Download and release notes
samloader download -m SM-S921E -r INS -v S921EXXS3CZI1/S921EOXM3CZI1/S921EXXS3CZI1Samsung's release notes and security patch level for this update: SM-S921E / INS on doc.samsungmobile.com. What each part of the build number means: decode S921EXXS3CZI1.