T636BXXSADZB4 – Galaxy Tab Active4 Pro firmware
Build T636BXXSADZB4 is a security update for the Galaxy Tab Active4 Pro (SM-T636B)
on Android 15 (One UI 7). It first appeared on Samsung's servers on Mar 8, 2026 (method) and has reached
21 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 T636BXXS9DYJ1 is blocked. Samsung still serves this file.
- Model
- SM-T636B
- Android
- Android 15
- Type
- Security
- Bootloader bit
- 10
- First released
- Mar 8, 2026
- Regions
- 21
Rollout timeline by region
The date each region code (CSC) first received T636BXXSADZB4, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
CAU | Caucasus | Mar 8, 2026 | day 0 | T636BXXSADZB4/T636BOXMADZB4/T636BXXSADZB4 |
EGY | Egypt | Mar 8, 2026 | day 0 | T636BXXSADZB4/T636BOJMADZB4/T636BXXSADZB4 |
EUX | Europe (Multi-CSC) | Mar 8, 2026 | day 0 | T636BXXSADZB4/T636BOXMADZB4/T636BXXSADZB4 |
EUY | Europe (Multi-CSC) | Mar 8, 2026 | day 0 | T636BXXSADZB4/T636BOXMADZB4/T636BXXSADZB4 |
ILO | Israel | Mar 8, 2026 | day 0 | T636BXXSADZB4/T636BOJMADZB4/T636BXXSADZB4 |
KSA | Saudi Arabia | Mar 8, 2026 | day 0 | T636BXXSADZB4/T636BOJMADZB4/T636BXXSADZB4 |
MID | Middle East | Mar 8, 2026 | day 0 | T636BXXSADZB4/T636BOJMADZB4/T636BXXSADZB4 |
MWD | Morocco | Mar 8, 2026 | day 0 | T636BXXSADZB4/T636BOJMADZB4/T636BXXSADZB4 |
SKZ | Kazakhstan | Mar 8, 2026 | day 0 | T636BXXSADZB4/T636BOXMADZB4/T636BXXSADZB4 |
XSG | United Arab Emirates | Mar 8, 2026 | day 0 | T636BXXSADZB4/T636BOJMADZB4/T636BXXSADZB4 |
TEL | Australia (Telstra) | Mar 9, 2026 | +1 day | T636BXXSADZB4/T636BOLMADZB4/T636BXXSADZB4 |
THL | Thailand | Mar 9, 2026 | +1 day | T636BXXSADZB4/T636BOLMADZB4/T636BXXSADZB4 |
XME | Malaysia | Mar 9, 2026 | +1 day | T636BXXSADZB4/T636BOLMADZB4/T636BXXSADZB4 |
XNZ | New Zealand | Mar 9, 2026 | +1 day | T636BXXSADZB4/T636BOLMADZB4/T636BXXSADZB4 |
XSA | Australia | Mar 9, 2026 | +1 day | T636BXXSADZB4/T636BOLMADZB4/T636BXXSADZB4 |
XSP | Singapore | Mar 9, 2026 | +1 day | T636BXXSADZB4/T636BOLMADZB4/T636BXXSADZB4 |
GTO | Guatemala | Mar 9, 2026 | +1 day | T636BXXSADZB4/T636BOWOADZB2/T636BXXSADZB4 |
MXO | Mexico | Mar 9, 2026 | +1 day | T636BXXSADZB4/T636BOWOADZB2/T636BXXSADZB4 |
CHO | Chile | Mar 10, 2026 | +2 days | T636BXXSADZB4/T636BOWOADZB2/T636BXXSADZB4 |
COO | Colombia | Mar 10, 2026 | +2 days | T636BXXSADZB4/T636BOWOADZB2/T636BXXSADZB4 |
PEO | Peru | Mar 10, 2026 | +2 days | T636BXXSADZB4/T636BOWOADZB2/T636BXXSADZB4 |
Download and release notes
samloader download -m SM-T636B -r EUX -v T636BXXSADZB4/T636BOXMADZB4/T636BXXSADZB4Samsung's release notes and security patch level for this update: SM-T636B / EUX on doc.samsungmobile.com. What each part of the build number means: decode T636BXXSADZB4.