G990U1UESOIZH2 – Galaxy S21 FE 5G firmware

Build G990U1UESOIZH2 is a security update for the Galaxy S21 FE 5G (SM-G990U1) on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 23, 2026 (method) and has reached 14 regions so far. It raises the bootloader bit from 23 to 24: once installed, the device no longer accepts firmware with bit 23 or lower, so a downgrade to G990U1UESNIZF3 is blocked. Samsung still serves this file.

Model
SM-G990U1
Android
Android 16
Type
Security
Bootloader bit
24
First released
Sep 23, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received G990U1UESOIZH2, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Sep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
AIOUSA (Cricket)Sep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
ATTUSA (AT&T)Sep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
CCTUSA (Comcast)Sep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
DSAUSASep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
DSHUSASep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
LRAUSA (Bluegrass)Sep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
TFNUSA (TracFone)Sep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
TMBUSA (T-Mobile)Sep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
TMKUSA (MetroPCS)Sep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
USCUSA (US Cellular)Sep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
VZWUSA (Verizon)Sep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
XAAUSA (unlocked)Sep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2
XARUSA (Cellular South)Sep 23, 2026day 0G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2

Download and release notes

samloader download -m SM-G990U1 -r XAA -v G990U1UESOIZH2/G990U1OYMOIZH2/G990U1UESOIZH2

Samsung's release notes and security patch level for this update: SM-G990U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode G990U1UESOIZH2.