G990U3UESKIZB2 – Galaxy S21 FE 5G firmware

Build G990U3UESKIZB2 is a security update for the Galaxy S21 FE 5G (SM-G990U3) on Android 16 (One UI 8). It first appeared on Samsung's servers on Mar 15, 2026 (method) and has reached 14 regions so far. It raises the bootloader bit from 19 to 20: once installed, the device no longer accepts firmware with bit 19 or lower, so a downgrade to G990U3UESJIZA1 is blocked. Samsung still serves this file.

Model
SM-G990U3
Android
Android 16
Type
Security
Bootloader bit
20
First released
Mar 15, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received G990U3UESKIZB2, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Mar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
AIOUSA (Cricket)Mar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
ATTUSA (AT&T)Mar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
CCTUSA (Comcast)Mar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
DSAUSAMar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
DSHUSAMar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
LRAUSA (Bluegrass)Mar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
TMBUSA (T-Mobile)Mar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
TMKUSA (MetroPCS)Mar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
USCUSA (US Cellular)Mar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
VZWUSA (Verizon)Mar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
XAAUSA (unlocked)Mar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
XARUSA (Cellular South)Mar 15, 2026day 0G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2
TFNUSA (TracFone)Mar 16, 2026+1 dayG990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2

Download and release notes

samloader download -m SM-G990U3 -r XAA -v G990U3UESKIZB2/G990U3OYMKIZB2/G990U3UESKIZB2

Samsung's release notes and security patch level for this update: SM-G990U3 / XAA on doc.samsungmobile.com. What each part of the build number means: decode G990U3UESKIZB2.