X356NKOSACZH4 – Galaxy Tab Active5 Pro 5G firmware
Build X356NKOSACZH4 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 Aug 26, 2026 (method) and has reached
1 region so far. It raises the bootloader bit from 9 to 10: once installed, the device no longer accepts firmware with bit 9 or lower, so a downgrade to X356NKOS9CZG5 is blocked. Samsung still serves this file.
- Model
- SM-X356N
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 10
- First released
- Aug 26, 2026
- Regions
- 1
Rollout timeline by region
The date each region code (CSC) first received X356NKOSACZH4, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
KOO | South Korea | Aug 26, 2026 | day 0 | X356NKOSACZH4/X356NKOOACZH4/X356NKOSACZH4 |
Download and release notes
samloader download -m SM-X356N -r KOO -v X356NKOSACZH4/X356NKOOACZH4/X356NKOSACZH4Samsung'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 X356NKOSACZH4.