F971NKSS4AZK1 – Galaxy Z Fold8 firmware
Build F971NKSS4AZK1 is a security update for the Galaxy Z Fold8 (SM-F971N)
on Android 17 (One UI 9). It first appeared on Samsung's servers on Nov 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 F971NKSU3AZIQ is blocked. Samsung still serves this file.
- Model
- SM-F971N
- Android
- Android 17
- Type
- Security
- Bootloader bit
- 4
- First released
- Nov 8, 2026
- Regions
- 4
Rollout timeline by region
The date each region code (CSC) first received F971NKSS4AZK1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
KOO | South Korea | Nov 8, 2026 | day 0 | F971NKSS4AZK1/F971NOKR4AZK1/F971NKSS4AZK1 |
KTC | South Korea (KT) | Nov 8, 2026 | day 0 | F971NKSS4AZK1/F971NOKR4AZK1/F971NKSS4AZK1 |
LUC | South Korea (LG U+) | Nov 8, 2026 | day 0 | F971NKSS4AZK1/F971NOKR4AZK1/F971NKSS4AZK1 |
SKC | South Korea (SKT) | Nov 8, 2026 | day 0 | F971NKSS4AZK1/F971NOKR4AZK1/F971NKSS4AZK1 |
Download and release notes
samloader download -m SM-F971N -r KOO -v F971NKSS4AZK1/F971NOKR4AZK1/F971NKSS4AZK1Samsung's release notes and security patch level for this update: SM-F971N / KOO on doc.samsungmobile.com. What each part of the build number means: decode F971NKSS4AZK1.