Samsung Galaxy S24 (SM-S921U) Firmware Overview
What is the latest SM-S921U firmware?
S921USQS6EZJ1, released October 16, 2026 with Android 17. It is a security update on bootloader binary 6. The archive holds 33 official builds across 12 regions (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy S24 still getting updates?
Yes. The newest build is from October 2026, and 6 of 12 regions already have a build from that month; the rest usually follow within a few weeks.
Which Android versions did it get?
The SM-S921U builds in the archive run Android 16 to 17. The earliest build we have for each version:
- Android 17: S921USQU6EZIF (Sep 2026), 18 builds in total
- Android 16: S921USQS6DZH3 (Aug 2026), 15 builds in total
Can I downgrade the SM-S921U firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. All decodable builds in the archive share binary 6:
- Binary 6 — since Aug 2026
All SM-S921U firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
S921USQS6EZJ1
Security update
|
6 | ATT | 17 |
2026-10-16 | Download |
|
S921USQS6EZJ1
Security update
|
6 | AIO | 17 |
2026-10-16 | Download |
|
S921USQS6EZJ1
Security update
|
6 | CCT | 17 |
2026-10-16 | Download |
|
S921USQS6EZJ1
Security update
|
6 | CHA | 17 |
2026-10-16 | Download |
|
S921USQS6EZJ1
Security update
|
6 | VZW | 17 |
2026-10-16 | Download |
|
S921USQS6EZJ1
Security update
|
6 | XAA | 17 |
2026-10-16 | Download |
|
S921USQU6EZIF
Feature update
|
6 | CCT | 17 |
2026-09-24 | Download |
|
S921USQU6EZIF
Feature update
|
6 | CHA | 17 |
2026-09-24 | Download |
|
S921USQU6EZIF
Feature update
|
6 | DSG | 17 |
2026-09-24 | Download |
|
S921USQU6EZIF
Feature update
|
6 | DSA | 17 |
2026-09-24 | Download |
|
S921USQU6EZIF
Feature update
|
6 | DSH | 17 |
2026-09-24 | Download |
|
S921USQU6EZIF
Feature update
|
6 | AIO | 17 |
2026-09-24 | Download |
|
S921USQU6EZIF
Feature update
|
6 | ATT | 17 |
2026-09-24 | Download |
|
S921USQU6EZIF
Feature update
|
6 | TMK | 17 |
2026-09-24 | Download |
|
S921USQU6EZIF
Feature update
|
6 | USC | 17 |
2026-09-24 | Download |
|
S921USQU6EZIF
Feature update
|
6 | TMB | 17 |
2026-09-24 | Download |
|
S921USQU6EZIF
Feature update
|
6 | XAA | 17 |
2026-09-24 | Download |
|
S921USQU6EZIF
Feature update
|
6 | VZW | 17 |
2026-09-24 | Download |
|
S921USQS6DZI1
Security update
|
6 | XAA | 16 |
2026-09-22 | Download |
|
S921USQS6DZI1
Security update
|
6 | ATT | 16 |
2026-09-22 | Download |
|
S921USQS6DZI1
Security update
|
6 | CCT | 16 |
2026-09-22 | Download |
|
S921USQS6DZI1
Security update
|
6 | CHA | 16 |
2026-09-22 | Download |
|
S921USQS6DZI1
Security update
|
6 | DSA | 16 |
2026-09-22 | Download |
|
S921USQS6DZI1
Security update
|
6 | DSG | 16 |
2026-09-22 | Download |
|
S921USQS6DZI1
Security update
|
6 | TMB | 16 |
2026-09-22 | Download |
|
S921USQS6DZI1
Security update
|
6 | DSH | 16 |
2026-09-22 | Download |
|
S921USQS6DZI1
Security update
|
6 | TMK | 16 |
2026-09-22 | Download |
|
S921USQS6DZI1
Security update
|
6 | USC | 16 |
2026-09-22 | Download |
|
S921USQS6DZI1
Security update
|
6 | VZW | 16 |
2026-09-22 | Download |
|
S921USQS6DZI1
Security update
|
6 | AIO | 16 |
2026-09-22 | Download |
|
S921USQS6DZH3
Security update
|
6 | CHA | 16 |
2026-08-14 | Download |
|
S921USQS6DZH3
Security update
|
6 | CCT | 16 |
2026-08-14 | Download |
|
S921USQS6DZH3
Security update
|
6 | XAA | 16 |
2026-08-14 | Download |
Latest SM-S921U Firmware by Region
The newest build for each region (CSC) code. Not sure which region your phone uses? See the CSC code guide.
| Region | Latest build | Bit | Android | Date |
|---|---|---|---|---|
| AIO | S921USQS6EZJ1 | 6 | 17 | 2026-10-16 |
| ATT | S921USQS6EZJ1 | 6 | 17 | 2026-10-16 |
| CCT | S921USQS6EZJ1 | 6 | 17 | 2026-10-16 |
| CHA | S921USQS6EZJ1 | 6 | 17 | 2026-10-16 |
| DSA | S921USQU6EZIF | 6 | 17 | 2026-09-24 |
| DSG | S921USQU6EZIF | 6 | 17 | 2026-09-24 |
| DSH | S921USQU6EZIF | 6 | 17 | 2026-09-24 |
| TMB | S921USQU6EZIF | 6 | 17 | 2026-09-24 |
| TMK | S921USQU6EZIF | 6 | 17 | 2026-09-24 |
| USC | S921USQU6EZIF | 6 | 17 | 2026-09-24 |
| VZW | S921USQS6EZJ1 | 6 | 17 | 2026-10-16 |
| XAA | S921USQS6EZJ1 | 6 | 17 | 2026-10-16 |
How to Flash SM-S921U Firmware
Put the Samsung Galaxy S24 into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Pick a build with Bit 6 or higher if your phone is already on the latest firmware. Use HOME_CSC to keep your data, CSC for a full wipe.