G990U3UESNIZI2 – Galaxy S21 FE 5G firmware
Build G990U3UESNIZI2 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 Oct 22, 2026 (method) and has reached
14 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 G990U3UESMIZH2 is blocked. Samsung still serves this file.
- Model
- SM-G990U3
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 23
- First released
- Oct 22, 2026
- Regions
- 14
Rollout timeline by region
The date each region code (CSC) first received G990U3UESNIZI2, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
ACG | USA (C Spire) | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
AIO | USA (Cricket) | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
ATT | USA (AT&T) | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
CCT | USA (Comcast) | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
DSA | USA | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
DSH | USA | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
LRA | USA (Bluegrass) | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
TFN | USA (TracFone) | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
TMB | USA (T-Mobile) | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
TMK | USA (MetroPCS) | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
USC | USA (US Cellular) | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
VZW | USA (Verizon) | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
XAA | USA (unlocked) | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
XAR | USA (Cellular South) | Oct 22, 2026 | day 0 | G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2 |
Download and release notes
samloader download -m SM-G990U3 -r XAA -v G990U3UESNIZI2/G990U3OYMNIZI2/G990U3UESNIZI2Samsung'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 G990U3UESNIZI2.