Samsung Galaxy Tab S12+ (SM-X840) Firmware Overview
What is the latest SM-X840 firmware?
X840XXU2AZJA, released November 2, 2026 with Android 17. It is a feature update on bootloader binary 2. The archive holds 20 official builds across 18 regions (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy Tab S12+ still getting updates?
Yes. The newest build is from November 2026, and 1 of 18 regions already have a build from that month; the rest usually follow within a few weeks.
Can I downgrade the SM-X840 firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. In the archive the binary of this model rose from 1 to 2:
- Binary 2 — since Oct 2026
- Binary 1 — since Aug 2026
A phone already on binary 2 rejects builds with a lower binary in Odin ("SW REV CHECK FAIL"), so it can go back to an earlier Android version only if that version has a binary 2 build. How to read a build number.
All SM-X840 firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
X840XXU2AZJA
Feature update
|
2 | KOO | 17 |
2026-11-02 | Download |
|
X840XXU1AZH3
Feature update
|
1 | XSP | 17 |
2026-09-05 | Download |
|
X840XXU1AZH3
Feature update
|
1 | TGY | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | INS | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | KOO | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | EUY | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | ILO | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | EUX | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | CAU | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | BRI | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | TUR | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | XSG | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | XAC | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | XAR | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | XID | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | XJP | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | XSP | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | ZBR | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | SKZ | 17 |
2026-08-11 | Download |
|
X840XXU1AZH3
Feature update
|
1 | MXO | 17 |
2026-08-11 | Download |
Latest SM-X840 Firmware by Region
The newest build for each region (CSC) code. Not sure which region your phone uses? See the CSC code guide.
| Region | Latest build | Bit | Android | Date |
|---|---|---|---|---|
| BRI | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| CAU | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| EUX | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| EUY | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| ILO | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| INS | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| KOO | X840XXU2AZJA | 2 | 17 | 2026-11-02 |
| MXO | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| SKZ | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| TGY | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| TUR | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| XAC | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| XAR | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| XID | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| XJP | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| XSG | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
| XSP | X840XXU1AZH3 | 1 | 17 | 2026-09-05 |
| ZBR | X840XXU1AZH3 | 1 | 17 | 2026-08-11 |
How to Flash SM-X840 Firmware
Put the Samsung Galaxy Tab S12+ into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Pick a build with Bit 2 or higher if your phone is already on the latest firmware. Use HOME_CSC to keep your data, CSC for a full wipe.