G990U2SQSNIZI2 – Galaxy S21 FE 5G firmware

Build G990U2SQSNIZI2 is a security update for the Galaxy S21 FE 5G (SM-G990U2) on Android 16 (One UI 8). It first appeared on Samsung's servers on Oct 20, 2026 (method) and has reached 9 regions so far. It raises the bootloader bit from 22 to 23: once installed, the device no longer accepts firmware with bit 22 or lower, so a downgrade to G990U2SQSMIZH2 is blocked. Samsung still serves this file.

Model
SM-G990U2
Android
Android 16
Type
Security
Bootloader bit
23
First released
Oct 20, 2026
Regions
9

Rollout timeline by region

The date each region code (CSC) first received G990U2SQSNIZI2, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
AIOUSA (Cricket)Oct 20, 2026day 0G990U2SQSNIZI2/G990U2OYNNIZI2/G990U2SQSNIZI2
ATTUSA (AT&T)Oct 20, 2026day 0G990U2SQSNIZI2/G990U2OYNNIZI2/G990U2SQSNIZI2
DSAUSAOct 21, 2026+1 dayG990U2SQSNIZI2/G990U2OYNNIZI2/G990U2SQSNIZI2
DSHUSAOct 21, 2026+1 dayG990U2SQSNIZI2/G990U2OYNNIZI2/G990U2SQSNIZI2
TMBUSA (T-Mobile)Oct 22, 2026+2 daysG990U2SQSNIZI2/G990U2OYNNIZI2/G990U2SQSNIZI2
TMKUSA (MetroPCS)Oct 22, 2026+2 daysG990U2SQSNIZI2/G990U2OYNNIZI2/G990U2SQSNIZI2
USCUSA (US Cellular)Oct 22, 2026+2 daysG990U2SQSNIZI2/G990U2OYNNIZI2/G990U2SQSNIZI2
VZWUSA (Verizon)Oct 22, 2026+2 daysG990U2SQSNIZI2/G990U2OYNNIZI2/G990U2SQSNIZI2
CCTUSA (Comcast)Nov 11, 2026+22 daysG990U2SQSNIZI2/G990U2OYNNIZI2/G990U2SQSNIZI2

Download and release notes

samloader download -m SM-G990U2 -r AIO -v G990U2SQSNIZI2/G990U2OYNNIZI2/G990U2SQSNIZI2

Samsung's release notes and security patch level for this update: SM-G990U2 / AIO on doc.samsungmobile.com. What each part of the build number means: decode G990U2SQSNIZI2.