S948NKSS4AZG3 – Galaxy S26 Ultra firmware
Build S948NKSS4AZG3 is a security update for the Galaxy S26 Ultra (SM-S948N)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Jul 8, 2026 (method) and has reached
4 regions so far. It raises the bootloader bit from 3 to 4: once installed, the device no longer accepts firmware with bit 3 or lower, so a downgrade to S948NKSS3AZF1 is blocked. Samsung still serves this file.
- Model
- SM-S948N
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 4
- First released
- Jul 8, 2026
- Regions
- 4
Rollout timeline by region
The date each region code (CSC) first received S948NKSS4AZG3, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
KOO | South Korea | Jul 8, 2026 | day 0 | S948NKSS4AZG3/S948NOKR4AZG3/S948NKSS4AZG1 |
KTC | South Korea (KT) | Jul 8, 2026 | day 0 | S948NKSS4AZG3/S948NOKR4AZG3/S948NKSS4AZG1 |
LUC | South Korea (LG U+) | Jul 8, 2026 | day 0 | S948NKSS4AZG3/S948NOKR4AZG3/S948NKSS4AZG1 |
SKC | South Korea (SKT) | Jul 8, 2026 | day 0 | S948NKSS4AZG3/S948NOKR4AZG3/S948NKSS4AZG1 |
Download and release notes
samloader download -m SM-S948N -r KOO -v S948NKSS4AZG3/S948NOKR4AZG3/S948NKSS4AZG1Samsung's release notes and security patch level for this update: SM-S948N / KOO on doc.samsungmobile.com. What each part of the build number means: decode S948NKSS4AZG3.