X308UUESFDZI1 – Galaxy Tab Active5 5G firmware
Build X308UUESFDZI1 is a security update for the Galaxy Tab Active5 5G (SM-X308U)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 30, 2026 (method) and has reached
4 regions so far. It raises the bootloader bit from 14 to 15: once installed, the device no longer accepts firmware with bit 14 or lower, so a downgrade to X308UUESEDZH2 is blocked. Samsung still serves this file.
- Model
- SM-X308U
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 15
- First released
- Sep 30, 2026
- Regions
- 4
Rollout timeline by region
The date each region code (CSC) first received X308UUESFDZI1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
ATT | USA (AT&T) | Sep 30, 2026 | day 0 | X308UUESFDZI1/X308UOYMFDZI1/X308UUESFDZI1 |
TMB | USA (T-Mobile) | Sep 30, 2026 | day 0 | X308UUESFDZI1/X308UOYMFDZI1/X308UUESFDZI1 |
VZW | USA (Verizon) | Sep 30, 2026 | day 0 | X308UUESFDZI1/X308UOYMFDZI1/X308UUESFDZI1 |
XAA | USA (unlocked) | Sep 30, 2026 | day 0 | X308UUESFDZI1/X308UOYMFDZI1/X308UUESFDZI1 |
Download and release notes
samloader download -m SM-X308U -r XAA -v X308UUESFDZI1/X308UOYMFDZI1/X308UUESFDZI1Samsung's release notes and security patch level for this update: SM-X308U / XAA on doc.samsungmobile.com. What each part of the build number means: decode X308UUESFDZI1.