X356NKOS8CZF3 – Galaxy Tab Active5 Pro 5G firmware
Build X356NKOS8CZF3 is a security update for the Galaxy Tab Active5 Pro 5G (SM-X356N)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Jun 21, 2026 (method) and has reached
1 region so far. It raises the bootloader bit from 7 to 8: once installed, the device no longer accepts firmware with bit 7 or lower, so a downgrade to X356NKOU7CZE4 is blocked. Samsung still serves this file.
- Model
- SM-X356N
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 8
- First released
- Jun 21, 2026
- Regions
- 1
Rollout timeline by region
The date each region code (CSC) first received X356NKOS8CZF3, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
KOO | South Korea | Jun 21, 2026 | day 0 | X356NKOS8CZF3/X356NKOO8CZF3/X356NKOS8CZF3 |
Download and release notes
samloader download -m SM-X356N -r KOO -v X356NKOS8CZF3/X356NKOO8CZF3/X356NKOS8CZF3Samsung's release notes and security patch level for this update: SM-X356N / KOO on doc.samsungmobile.com. What each part of the build number means: decode X356NKOS8CZF3.