Samsung Galaxy S8+ (SM-G955U1) Firmware Overview
What is the latest SM-G955U1 firmware?
G955U1UEU8DZE2, released May 19, 2026 with Android 9. It is a feature update on bootloader binary 8. The archive holds 20 official builds across 13 regions (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy S8+ still getting updates?
Yes. The newest build is from May 2026, and 11 of 13 regions already have a build from that month; the rest usually follow within a few weeks.
Can I downgrade the SM-G955U1 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 8:
- Binary 8 — since Jul 2021
- Binary 5 — since Jun 2018
- Binary 3 — since Apr 2018
- Binary 2 — since Nov 2017
- Binary 1 — since Apr 2017
A phone already on binary 8 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 8 build. How to read a build number.
All SM-G955U1 firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
G955U1UEU8DZE2
Feature update
|
8 | SPR | 9 |
2026-05-19 | Download |
|
G955U1UEU8DZE2
Feature update
|
8 | AIO | 9 |
2026-05-19 | Download |
|
G955U1UEU8DZE2
Feature update
|
8 | TMB | 9 |
2026-05-19 | Download |
|
G955U1UEU8DZE2
Feature update
|
8 | ATT | 9 |
2026-05-19 | Download |
|
G955U1UEU8DZE2
Feature update
|
8 | VZW | 9 |
2026-05-19 | Download |
|
G955U1UEU8DZE2
Feature update
|
8 | XAA | 9 |
2026-05-19 | Download |
|
G955U1UEU8DZE2
Feature update
|
8 | ACG | 9 |
2026-05-19 | Download |
|
G955U1UEU8DZE2
Feature update
|
8 | TMK | 9 |
2026-05-19 | Download |
|
G955U1UEU8DZE2
Feature update
|
8 | TFN | 9 |
2026-05-19 | Download |
|
G955U1UEU8DZE2
Feature update
|
8 | LRA | 9 |
2026-05-19 | Download |
|
G955U1UEU8DZE2
Feature update
|
8 | USC | 9 |
2026-05-19 | Download |
|
G955U1UEU8DVD4
Feature update
|
8 | TMK | 9 |
2022-04-26 | Download |
|
G955U1UEU8DVD4
Feature update
|
8 | TMB | 9 |
2022-04-26 | Download |
|
G955U1UEU8DVD4
Feature update
|
8 | XAA | 9 |
2022-04-26 | Download |
|
G955U1UEU8DVD4
Feature update
|
8 | AIO | 9 |
2022-04-26 | Download |
|
G955U1UEU8DVD4
Feature update
|
8 | ATT | 9 |
2022-04-26 | Download |
|
G955U1UEU8DUG4
Feature update
|
8 | XAS | 9 |
2021-08-23 | Download |
|
G955U1UEU8DUG4
Feature update
|
8 | XAA | 9 |
2021-08-23 | Download |
|
G955U1UEU8DUG4
Feature update
|
8 | VZW | 9 |
2021-08-23 | Download |
|
G955U1UEU8DUG4
Feature update
|
8 | VMU | 9 |
2021-08-23 | Download |
Latest SM-G955U1 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 |
|---|---|---|---|---|
| ACG | G955U1UEU8DZE2 | 8 | 9 | 2026-05-19 |
| AIO | G955U1UEU8DZE2 | 8 | 9 | 2026-05-19 |
| ATT | G955U1UEU8DZE2 | 8 | 9 | 2026-05-19 |
| LRA | G955U1UEU8DZE2 | 8 | 9 | 2026-05-19 |
| SPR | G955U1UEU8DZE2 | 8 | 9 | 2026-05-19 |
| TFN | G955U1UEU8DZE2 | 8 | 9 | 2026-05-19 |
| TMB | G955U1UEU8DZE2 | 8 | 9 | 2026-05-19 |
| TMK | G955U1UEU8DZE2 | 8 | 9 | 2026-05-19 |
| USC | G955U1UEU8DZE2 | 8 | 9 | 2026-05-19 |
| VMU | G955U1UEU8DUG4 | 8 | 9 | 2021-08-23 |
| VZW | G955U1UEU8DZE2 | 8 | 9 | 2026-05-19 |
| XAA | G955U1UEU8DZE2 | 8 | 9 | 2026-05-19 |
| XAS | G955U1UEU8DUG4 | 8 | 9 | 2021-08-23 |
Older SM-G955U1 Builds (Archive)
13 earlier builds from the samdb.org catalogue. They are not in the download list above; the link searches for the build on the partner site.
| Build / PDA | Bit | Month | Regions (CSC) | |
|---|---|---|---|---|
| G955U1UEU5CRJ2 | 5 | Oct 2018 | ACG, AIO, ATT, BST, LRA, SPR, TFN, TMB, TMK, USC, VMU, VZW, XAA, XAS | Find |
| G955U1UES5CRI1 | 5 | Sep 2018 | ACG, ATT, BST, LRA, SPR, TFN, TMB, TMK, USC, VMU, VZW, XAA, XAS | Find |
| G955U1UEU5CRH3 | 5 | Aug 2018 | ACG, AIO, ATT, BST, LRA, SPR, TFN, TMB, TMK, USC, VZW, XAA, XAS | Find |
| G955U1UES5CRF5 | 5 | Jun 2018 | ACG, AIO, ATT, LRA, SPR, TFN, TMB, TMK, USC, VZW, XAA | Find |
| G955U1UES3CRE2 | 3 | May 2018 | ACG, AIO, ATT, LRA, SPR, TFN, TMB, TMK, USC, VZW, XAA | Find |
| G955U1UEU3CRD4 | 3 | Apr 2018 | ACG, AIO, ATT, LRA, SPR, TFN, TMB, TMK, USC, VZW, XAA, XAS | Find |
| G955U1UEU2CRB9 | 2 | Feb 2018 | ACG, AIO, ATT, BST, LRA, SPR, TFN, TMB, TMK, USC, VMU, VZW, XAA, XAS | Find |
| G955U1UES2AQL1 | 2 | Dec 2017 | ACG, AIO, ATT, BST, LRA, SPR, TFN, TMB, TMK, USC, VZW, XAA, XAS | Find |
| G955U1UEU2AQK2 | 2 | Nov 2017 | ACG, AIO, ATT, BST, LRA, SPR, TFN, TMB, TMK, USC, VMU, VZW, XAA, XAS | Find |
| G955U1UEU1AQH3 | 1 | Aug 2017 | ACG, AIO, ATT, BST, LRA, SPR, TFN, TMB, TMK, USC, VMU, VZW, XAA, XAS | Find |
| G955U1UEU1AQG2 | 1 | Jul 2017 | ACG, AIO, ATT, BST, LRA, SPR, TFN, TMB, TMK, USC, VMU, VZW, XAA, XAS | Find |
| G955U1UEU1AQE3 | 1 | May 2017 | ACG, AIO, ATT, BST, LRA, SPR, TFN, TMB, TMK, USC, VMU, VZW, XAA, XAS | Find |
| G955U1UEU1AQDC | 1 | Apr 2017 | ACG, AIO, ATT, BST, LRA, SPR, TFN, TMB, TMK, USC, VMU, VZW, XAA, XAS | Find |
How to Flash SM-G955U1 Firmware
Put the Samsung Galaxy S8+ 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 8 or higher if your phone is already on the latest firmware. Use HOME_CSC to keep your data, CSC for a full wipe.