G955U1UEU8DUG4 – Galaxy S8+ firmware

Build G955U1UEU8DUG4 is a feature update for the Galaxy S8+ (SM-G955U1) on Android 9. It first appeared on Samsung's servers on Aug 22, 2021 (method) and has reached 14 regions so far. It keeps bootloader bit 8, so downgrading to the previous build G955U1UEU8DUD3 is still possible. Samsung still serves this file.

Model
SM-G955U1
Android
Android 9
Type
Feature
Bootloader bit
8
First released
Aug 22, 2021
Regions
14

Rollout timeline by region

The date each region code (CSC) first received G955U1UEU8DUG4, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
AIOUSA (Cricket)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
ATTUSA (AT&T)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
BSTUSA (Boost)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
LRAUSA (Bluegrass)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
SPRUSA (Sprint)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
TFNUSA (TracFone)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
TMBUSA (T-Mobile)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
TMKUSA (MetroPCS)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
USCUSA (US Cellular)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
VMUUSA (Virgin)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
VZWUSA (Verizon)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
XAAUSA (unlocked)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4
XASUSA (Sprint)Aug 22, 2021day 0G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4

Download and release notes

samloader download -m SM-G955U1 -r XAA -v G955U1UEU8DUG4/G955U1OYM8DUG4/G955U1UEU8DUG4

Samsung's release notes and security patch level for this update: SM-G955U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode G955U1UEU8DUG4.