X300XXSACZB3 – Galaxy Tab Active5 firmware
Build X300XXSACZB3 is a security update for the Galaxy Tab Active5 (SM-X300)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Mar 8, 2026 (method) and has reached
6 regions 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 X300XXS9CZA3 is blocked. Samsung still serves this file.
- Model
- SM-X300
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 10
- First released
- Mar 8, 2026
- Regions
- 6
Rollout timeline by region
The date each region code (CSC) first received X300XXSACZB3, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
EUX | Europe (Multi-CSC) | Mar 8, 2026 | day 0 | X300XXSACZB3/X300OXMACZB3/X300XXSACZB3 |
EUY | Europe (Multi-CSC) | Mar 8, 2026 | day 0 | X300XXSACZB3/X300OXMACZB3/X300XXSACZB3 |
SKZ | Kazakhstan | Mar 8, 2026 | day 0 | X300XXSACZB3/X300OXMACZB3/X300XXSACZB3 |
XSP | Singapore | Mar 8, 2026 | day 0 | X300XXSACZB3/X300OLMACZB3/X300XXSACZB3 |
MXO | Mexico | Mar 9, 2026 | +1 day | X300XXSACZB3/X300OWOACZB3/X300XXSACZB3 |
XAR | USA (Cellular South) | Mar 9, 2026 | +1 day | X300XXSACZB3/X300OXMACZB3/X300XXSACZB3 |
Download and release notes
samloader download -m SM-X300 -r EUX -v X300XXSACZB3/X300OXMACZB3/X300XXSACZB3Samsung's release notes and security patch level for this update: SM-X300 / EUX on doc.samsungmobile.com. What each part of the build number means: decode X300XXSACZB3.