G990U1UESLIZA1 – Galaxy S21 FE 5G firmware

Build G990U1UESLIZA1 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 Jan 29, 2026 (method) and has reached 14 regions so far. It raises the bootloader bit from 20 to 21: once installed, the device no longer accepts firmware with bit 20 or lower, so a downgrade to G990U1UESKIYL1 is blocked. Samsung still serves this file.

Model
SM-G990U1
Android
Android 16
Type
Security
Bootloader bit
21
First released
Jan 29, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received G990U1UESLIZA1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Jan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
AIOUSA (Cricket)Jan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
ATTUSA (AT&T)Jan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
CCTUSA (Comcast)Jan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
DSAUSAJan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
DSHUSAJan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
LRAUSA (Bluegrass)Jan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
TFNUSA (TracFone)Jan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
TMBUSA (T-Mobile)Jan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
TMKUSA (MetroPCS)Jan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
USCUSA (US Cellular)Jan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
VZWUSA (Verizon)Jan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
XAAUSA (unlocked)Jan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1
XARUSA (Cellular South)Jan 29, 2026day 0G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1

Download and release notes

samloader download -m SM-G990U1 -r XAA -v G990U1UESLIZA1/G990U1OYMLIZA1/G990U1UESLIZA1

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 G990U1UESLIZA1.