Samsung Galaxy S26 Ultra (SM-S948U1) Firmware Overview
What is the latest SM-S948U1 firmware?
S948U1UEU5BZJA, released October 16, 2026 with Android 17. It is a feature update on bootloader binary 5. The archive holds 42 official builds across 21 regions (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy S26 Ultra still getting updates?
Yes. The newest build is from October 2026, and 19 of 21 regions already have a build from that month; the rest usually follow within a few weeks.
Can I downgrade the SM-S948U1 firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. In the archive the binary of this model rose from 4 to 5:
- Binary 5 — since Oct 2026
- Binary 4 — since Sep 2026
A phone already on binary 5 rejects builds with a lower binary in Odin ("SW REV CHECK FAIL"), so it can go back to an earlier Android version only if that version has a binary 5 build. How to read a build number.
All SM-S948U1 firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
S948U1UEU5BZJA
Feature update
|
5 | TMB | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | XAA | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | LRA | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | TMK | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | ATT | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | ACG | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | FKR | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | DSH | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | CCT | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | DSA | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | CHA | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | XAG | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | VZW | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | TFN | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | AIO | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | XAR | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | ATC | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | USC | 17 |
2026-10-16 | Download |
|
S948U1UEU5BZJA
Feature update
|
5 | DSG | 17 |
2026-10-16 | Download |
|
S948U1UES4BZIG
Security update
|
4 | LLA | 17 |
2026-09-30 | Download |
|
S948U1UES4BZIG
Security update
|
4 | PCT | 17 |
2026-09-30 | Download |
|
S948U1UES4BZIG
Security update
|
4 | XAA | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | DSG | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | XAR | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | AIO | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | TFN | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | XAG | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | CCT | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | VZW | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | CHA | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | FKR | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | DSH | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | DSA | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | ATC | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | ACG | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | TMB | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | TMK | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | LRA | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | ATT | 17 |
2026-09-29 | Download |
|
S948U1UES4BZIG
Security update
|
4 | USC | 17 |
2026-09-29 | Download |
|
S948U1UEU4BZID
Feature update
|
4 | LLA | 17 |
2026-09-22 | Download |
|
S948U1UEU4BZID
Feature update
|
4 | AIO | 17 |
2026-09-20 | Download |
Latest SM-S948U1 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 | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| AIO | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| ATC | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| ATT | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| CCT | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| CHA | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| DSA | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| DSG | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| DSH | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| FKR | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| LLA | S948U1UES4BZIG | 4 | 17 | 2026-09-30 |
| LRA | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| PCT | S948U1UES4BZIG | 4 | 17 | 2026-09-30 |
| TFN | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| TMB | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| TMK | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| USC | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| VZW | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| XAA | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| XAG | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
| XAR | S948U1UEU5BZJA | 5 | 17 | 2026-10-16 |
How to Flash SM-S948U1 Firmware
Put the Samsung Galaxy S26 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 5 or higher if your phone is already on the latest firmware. Use HOME_CSC to keep your data, CSC for a full wipe.