G990U2SQSKIZB2 – Galaxy S21 FE 5G firmware

Build G990U2SQSKIZB2 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 Mar 10, 2026 (method) and has reached 9 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 G990U2SQSJIZA1 is blocked. Samsung still serves this file.

Model
SM-G990U2
Android
Android 16
Type
Security
Bootloader bit
20
First released
Mar 10, 2026
Regions
9

Rollout timeline by region

The date each region code (CSC) first received G990U2SQSKIZB2, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ATTUSA (AT&T)Mar 10, 2026day 0G990U2SQSKIZB2/G990U2OYNKIZB2/G990U2SQSKIZB2
AIOUSA (Cricket)Mar 10, 2026day 0G990U2SQSKIZB2/G990U2OYNKIZB2/G990U2SQSKIZB2
TMBUSA (T-Mobile)Mar 12, 2026+2 daysG990U2SQSKIZB2/G990U2OYNKIZB2/G990U2SQSKIZB2
TMKUSA (MetroPCS)Mar 12, 2026+2 daysG990U2SQSKIZB2/G990U2OYNKIZB2/G990U2SQSKIZB2
DSAUSAMar 13, 2026+3 daysG990U2SQSKIZB2/G990U2OYNKIZB2/G990U2SQSKIZB2
DSHUSAMar 13, 2026+3 daysG990U2SQSKIZB2/G990U2OYNKIZB2/G990U2SQSKIZB2
CCTUSA (Comcast)Mar 16, 2026+6 daysG990U2SQSKIZB2/G990U2OYNKIZB2/G990U2SQSKIZB2
VZWUSA (Verizon)Mar 16, 2026+6 daysG990U2SQSKIZB2/G990U2OYNKIZB2/G990U2SQSKIZB2
USCUSA (US Cellular)Mar 18, 2026+8 daysG990U2SQSKIZB2/G990U2OYNKIZB2/G990U2SQSKIZB2

Download and release notes

samloader download -m SM-G990U2 -r ATT -v G990U2SQSKIZB2/G990U2OYNKIZB2/G990U2SQSKIZB2

Samsung's release notes and security patch level for this update: SM-G990U2 / ATT on doc.samsungmobile.com. What each part of the build number means: decode G990U2SQSKIZB2.