X115NKOS9DZB6 – Galaxy Tab A9 firmware
Build X115NKOS9DZB6 is a security update for the Galaxy Tab A9 (SM-X115N)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Mar 5, 2026 (method) and has reached
1 region so far. It raises the bootloader bit from 8 to 9: once installed, the device no longer accepts firmware with bit 8 or lower, so a downgrade to X115NKOS8DZA6 is blocked. Samsung still serves this file.
- Model
- SM-X115N
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 9
- First released
- Mar 5, 2026
- Regions
- 1
Rollout timeline by region
The date each region code (CSC) first received X115NKOS9DZB6, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
KOO | South Korea | Mar 5, 2026 | day 0 | X115NKOS9DZB6/X115NKOO9DZB6/X115NKOS9DZB2 |
Download and release notes
samloader download -m SM-X115N -r KOO -v X115NKOS9DZB6/X115NKOO9DZB6/X115NKOS9DZB2Samsung's release notes and security patch level for this update: SM-X115N / KOO on doc.samsungmobile.com. What each part of the build number means: decode X115NKOS9DZB6.