Samsung Galaxy S23 Ultra (SM-S918U1) Firmware Overview
What is the latest SM-S918U1 firmware?
S918U1UEU8GZIF, released September 29, 2026 with Android 17. It is a feature update on bootloader binary 8. The archive holds 38 official builds across 20 regions (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy S23 Ultra still getting updates?
Yes. The newest build is from September 2026, and 18 of 20 regions already have a build from that month; the rest usually follow within a few weeks.
Which Android versions did it get?
The SM-S918U1 builds in the archive run Android 16 to 17. The earliest build we have for each version:
- Android 17: S918U1UEU8GZIF (Sep 2026), 18 builds in total
- Android 16: S918U1UES8FZH3 (Aug 2026), 20 builds in total
Can I downgrade the SM-S918U1 firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. All decodable builds in the archive share binary 8:
- Binary 8 — since Aug 2026
All SM-S918U1 firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
S918U1UEU8GZIF
Feature update
|
8 | USC | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | XAG | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | VZW | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | CCT | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | XAA | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | TMK | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | DSA | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | ACG | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | TMB | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | CHA | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | XAR | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | ATT | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | ATC | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | DSH | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | FKR | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | LRA | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | AIO | 17 |
2026-09-29 | Download |
|
S918U1UEU8GZIF
Feature update
|
8 | TFN | 17 |
2026-09-29 | Download |
|
S918U1UES8FZI1
Security update
|
8 | XAG | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | CCT | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | USC | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | XAA | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | ACG | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | CHA | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | TMB | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | ATT | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | XAR | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | LRA | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | DSA | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | AIO | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | TMK | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | ATC | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | DSH | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | FKR | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | TFN | 16 |
2026-09-14 | Download |
|
S918U1UES8FZI1
Security update
|
8 | VZW | 16 |
2026-09-14 | Download |
|
S918U1UES8FZH3
Security update
|
8 | LLA | 16 |
2026-08-14 | Download |
|
S918U1UES8FZH3
Security update
|
8 | PCT | 16 |
2026-08-14 | Download |
Latest SM-S918U1 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 |
|---|---|---|---|---|
| ACG | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| AIO | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| ATC | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| ATT | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| CCT | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| CHA | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| DSA | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| DSH | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| FKR | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| LLA | S918U1UES8FZH3 | 8 | 16 | 2026-08-14 |
| LRA | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| PCT | S918U1UES8FZH3 | 8 | 16 | 2026-08-14 |
| TFN | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| TMB | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| TMK | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| USC | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| VZW | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| XAA | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| XAG | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
| XAR | S918U1UEU8GZIF | 8 | 17 | 2026-09-29 |
How to Flash SM-S918U1 Firmware
Put the Samsung Galaxy S23 Ultra 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 8 or higher if your phone is already on the latest firmware. Use HOME_CSC to keep your data, CSC for a full wipe.