G990B2XXSIIZB2 – Galaxy S21 FE 5G firmware

Build G990B2XXSIIZB2 is a security update for the Galaxy S21 FE 5G (SM-G990B2) on Android 16 (One UI 8). It first appeared on Samsung's servers on Mar 9, 2026 (method) and has reached 48 regions so far. It raises the bootloader bit from 17 to 18: once installed, the device no longer accepts firmware with bit 17 or lower, so a downgrade to G990B2XXSHIZA1 is blocked. Samsung still serves this file.

Model
SM-G990B2
Android
Android 16
Type
Security
Bootloader bit
18
First released
Mar 9, 2026
Regions
48

Rollout timeline by region

The date each region code (CSC) first received G990B2XXSIIZB2, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
TURTurkeyMar 9, 2026day 0G990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
3IEIreland (3)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
ATLSpain (Vodafone)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
BOGFrance (Bouygues)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
BTBUnited Kingdom (BT)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
CAUCaucasusMar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
CNXRomania (Vodafone)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
COSGreece (Cosmote)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
CROCroatiaMar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
DTMGermany (Telekom)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
EUXEurope (Multi-CSC)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
EUYEurope (Multi-CSC)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
EVRUnited Kingdom (EE)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
FTMFrance (Orange)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
H3GItaly (3)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
MEOPortugal (MEO)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
MOBAustria (A1)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
MOTSlovenia (Telekom)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
MSRSerbiaMar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
O2CCzech Republic (O2)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
O2UUnited Kingdom (O2)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
OMNItaly (Vodafone)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
OPVPoland (Orange)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
ORORomania (Orange)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
PLSPoland (Plus)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
PRTPoland (Play)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
SEKUkraineMar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
SERRussiaMar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
SFRFrance (SFR)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
SIMSlovenia (A1)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
SKZKazakhstanMar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
SWCSwitzerlandMar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
TCLPortugal (Vodafone)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
TIMItaly (TIM)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
TMHHungary (Telekom)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
TMSSlovakia (Telekom)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
TPLPoland (T-Mobile)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
VD2Germany (Vodafone)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
VDFNetherlands (Vodafone)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
VDIIreland (Vodafone)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
VGRGreece (Vodafone)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
VIPCroatia (A1)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
VODUnited Kingdom (Vodafone)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
XECSpain (Movistar)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
TMZCzech Republic (T-Mobile)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
TNLNetherlands (T-Mobile)Mar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
TOPSerbia/MontenegroMar 10, 2026+1 dayG990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1
INSIndiaMar 16, 2026+7 daysG990B2XXSIIZB2/G990B2ODMIIZB1/G990B2XXSIIZB1

Download and release notes

samloader download -m SM-G990B2 -r EUX -v G990B2XXSIIZB2/G990B2OXMIIZB2/G990B2XXSIIZB1

Samsung's release notes and security patch level for this update: SM-G990B2 / EUX on doc.samsungmobile.com. What each part of the build number means: decode G990B2XXSIIZB2.