F956NKSS4EZJ1 – Galaxy Z Fold6 firmware
Build F956NKSS4EZJ1 is a security update for the Galaxy Z Fold6 (SM-F956N)
on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 26, 2026 (method) and has reached
4 regions so far. It keeps bootloader bit 4, so downgrading to the previous build F956NKSU4EZIH is still possible. Samsung still serves this file.
- Model
- SM-F956N
- Android
- Android 17
- Type
- Security
- Bootloader bit
- 4
- First released
- Oct 26, 2026
- Regions
- 4
Rollout timeline by region
The date each region code (CSC) first received F956NKSS4EZJ1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
KOO | South Korea | Oct 26, 2026 | day 0 | F956NKSS4EZJ1/F956NOKR4EZJ1/F956NKSU4EZI4 |
KTC | South Korea (KT) | Oct 26, 2026 | day 0 | F956NKSS4EZJ1/F956NOKR4EZJ1/F956NKSU4EZI4 |
LUC | South Korea (LG U+) | Oct 26, 2026 | day 0 | F956NKSS4EZJ1/F956NOKR4EZJ1/F956NKSU4EZI4 |
SKC | South Korea (SKT) | Oct 26, 2026 | day 0 | F956NKSS4EZJ1/F956NOKR4EZJ1/F956NKSU4EZI4 |
Download and release notes
samloader download -m SM-F956N -r KOO -v F956NKSS4EZJ1/F956NOKR4EZJ1/F956NKSU4EZI4Samsung's release notes and security patch level for this update: SM-F956N / KOO on doc.samsungmobile.com. What each part of the build number means: decode F956NKSS4EZJ1.