Samsung Galaxy S26 Ultra (SM-S948N) Firmware Overview
What is the latest SM-S948N firmware?
S948NKSU5BZJB, released October 16, 2026 with Android 17. It is a feature update on bootloader binary 5. The archive holds 24 official builds across 4 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 4 of 4 regions already have a build from that month; the rest usually follow within a few weeks.
Which Android versions did it get?
The SM-S948N builds in the archive run Android 16 to 17. The earliest build we have for each version:
- Android 17: S948NKSU4BZI6 (Sep 2026), 12 builds in total
- Android 16: S948NKSS2AZE1 (May 2026), 12 builds in total
Can I downgrade the SM-S948N firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. In the archive the binary of this model rose from 2 to 5:
- Binary 5 — since Oct 2026
- Binary 4 — since Jul 2026
- Binary 2 — since May 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-S948N firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
S948NKSU5BZJB
Feature update
|
5 | SKC | 17 |
2026-10-16 | Download |
|
S948NKSU5BZJB
Feature update
|
5 | KOO | 17 |
2026-10-16 | Download |
|
S948NKSU5BZJB
Feature update
|
5 | KTC | 17 |
2026-10-16 | Download |
|
S948NKSU5BZJB
Feature update
|
5 | LUC | 17 |
2026-10-16 | Download |
|
S948NKSS4BZIG
Security update
|
4 | SKC | 17 |
2026-09-23 | Download |
|
S948NKSS4BZIG
Security update
|
4 | KTC | 17 |
2026-09-23 | Download |
|
S948NKSS4BZIG
Security update
|
4 | LUC | 17 |
2026-09-23 | Download |
|
S948NKSS4BZIG
Security update
|
4 | KOO | 17 |
2026-09-23 | Download |
|
S948NKSU4BZI6
Feature update
|
4 | KTC | 17 |
2026-09-12 | Download |
|
S948NKSU4BZI6
Feature update
|
4 | KOO | 17 |
2026-09-07 | Download |
|
S948NKSU4BZI6
Feature update
|
4 | SKC | 17 |
2026-09-07 | Download |
|
S948NKSU4BZI6
Feature update
|
4 | LUC | 17 |
2026-09-07 | Download |
|
S948NKSU4AZHJ
Feature update
|
4 | SKC | 16 |
2026-08-23 | Download |
|
S948NKSU4AZHJ
Feature update
|
4 | KTC | 16 |
2026-08-23 | Download |
|
S948NKSU4AZHJ
Feature update
|
4 | LUC | 16 |
2026-08-23 | Download |
|
S948NKSU4AZHJ
Feature update
|
4 | KOO | 16 |
2026-08-23 | Download |
|
S948NKSS4AZG3
Security update
|
4 | SKC | 16 |
2026-07-02 | Download |
|
S948NKSS4AZG3
Security update
|
4 | LUC | 16 |
2026-07-02 | Download |
|
S948NKSS4AZG3
Security update
|
4 | KTC | 16 |
2026-07-02 | Download |
|
S948NKSS4AZG3
Security update
|
4 | KOO | 16 |
2026-07-02 | Download |
|
S948NKSS2AZE1
Security update
|
2 | KOO | 16 |
2026-05-11 | Download |
|
S948NKSS2AZE1
Security update
|
2 | SKC | 16 |
2026-05-11 | Download |
|
S948NKSS2AZE1
Security update
|
2 | KTC | 16 |
2026-05-11 | Download |
|
S948NKSS2AZE1
Security update
|
2 | LUC | 16 |
2026-05-11 | Download |
Latest SM-S948N 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 |
|---|---|---|---|---|
| KOO | S948NKSU5BZJB | 5 | 17 | 2026-10-16 |
| KTC | S948NKSU5BZJB | 5 | 17 | 2026-10-16 |
| LUC | S948NKSU5BZJB | 5 | 17 | 2026-10-16 |
| SKC | S948NKSU5BZJB | 5 | 17 | 2026-10-16 |
How to Flash SM-S948N 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.