G955FXXUCDZEF – Galaxy S8+ firmware
Build G955FXXUCDZEF is a feature update for the Galaxy S8+ (SM-G955FD)
on Android 9. It first appeared on Samsung's servers on Jun 25, 2026 (method) and has reached
1 region so far. It keeps bootloader bit 12, so downgrading to the previous build G955FXXUCDZEI is still possible. Samsung still serves this file.
- Model
- SM-G955FD
- Android
- Android 9
- Type
- Feature
- Bootloader bit
- 12
- First released
- Jun 25, 2026
- Regions
- 1
Rollout timeline by region
The date each region code (CSC) first received G955FXXUCDZEF, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
ZTO | Brazil | Jun 25, 2026 | day 0 | G955FXXUCDZEF/G955FOXMCDZF1/G955FXXUCDUD1 |
Download and release notes
samloader download -m SM-G955FD -r ZTO -v G955FXXUCDZEF/G955FOXMCDZF1/G955FXXUCDUD1Samsung's release notes and security patch level for this update: SM-G955FD / ZTO on doc.samsungmobile.com. What each part of the build number means: decode G955FXXUCDZEF.