S948NKSU5BZJB – Galaxy S26 Ultra firmware
Build S948NKSU5BZJB is a feature update for the Galaxy S26 Ultra (SM-S948N)
on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 25, 2026 (method) and has reached
4 regions so far. It raises the bootloader bit from 4 to 5: once installed, the device no longer accepts firmware with bit 4 or lower, so a downgrade to S948NKSS4BZIG is blocked. Samsung still serves this file.
- Model
- SM-S948N
- Android
- Android 17
- Type
- Feature
- Bootloader bit
- 5
- First released
- Oct 25, 2026
- Regions
- 4
Rollout timeline by region
The date each region code (CSC) first received S948NKSU5BZJB, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
KOO | South Korea | Oct 25, 2026 | day 0 | S948NKSU5BZJB/S948NOKR5BZJB/S948NKSU5BZJB |
KTC | South Korea (KT) | Oct 25, 2026 | day 0 | S948NKSU5BZJB/S948NOKR5BZJB/S948NKSU5BZJB |
LUC | South Korea (LG U+) | Oct 25, 2026 | day 0 | S948NKSU5BZJB/S948NOKR5BZJB/S948NKSU5BZJB |
SKC | South Korea (SKT) | Oct 25, 2026 | day 0 | S948NKSU5BZJB/S948NOKR5BZJB/S948NKSU5BZJB |
Download and release notes
samloader download -m SM-S948N -r KOO -v S948NKSU5BZJB/S948NOKR5BZJB/S948NKSU5BZJBSamsung'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 S948NKSU5BZJB.