G990USQSOIZH2 – Galaxy S21 FE 5G firmware

Build G990USQSOIZH2 is a security update for the Galaxy S21 FE 5G (SM-G990U) on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 21, 2026 (method) and has reached 9 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 G990USQSNIZF2 is blocked. Samsung still serves this file.

Model
SM-G990U
Android
Android 16
Type
Security
Bootloader bit
24
First released
Sep 21, 2026
Regions
9

Rollout timeline by region

The date each region code (CSC) first received G990USQSOIZH2, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ATTUSA (AT&T)Sep 21, 2026day 0G990USQSOIZH2/G990UOYNOIZH2/G990USQSOIZH2
CCTUSA (Comcast)Sep 21, 2026day 0G990USQSOIZH2/G990UOYNOIZH2/G990USQSOIZH2
AIOUSA (Cricket)Sep 21, 2026day 0G990USQSOIZH2/G990UOYNOIZH2/G990USQSOIZH2
DSAUSASep 21, 2026day 0G990USQSOIZH2/G990UOYNOIZH2/G990USQSOIZH2
DSHUSASep 21, 2026day 0G990USQSOIZH2/G990UOYNOIZH2/G990USQSOIZH2
TMBUSA (T-Mobile)Sep 21, 2026day 0G990USQSOIZH2/G990UOYNOIZH2/G990USQSOIZH2
TMKUSA (MetroPCS)Sep 21, 2026day 0G990USQSOIZH2/G990UOYNOIZH2/G990USQSOIZH2
USCUSA (US Cellular)Sep 21, 2026day 0G990USQSOIZH2/G990UOYNOIZH2/G990USQSOIZH2
VZWUSA (Verizon)Sep 21, 2026day 0G990USQSOIZH2/G990UOYNOIZH2/G990USQSOIZH2

Download and release notes

samloader download -m SM-G990U -r ATT -v G990USQSOIZH2/G990UOYNOIZH2/G990USQSOIZH2

Samsung's release notes and security patch level for this update: SM-G990U / ATT on doc.samsungmobile.com. What each part of the build number means: decode G990USQSOIZH2.