G990USQSMIZB2 – Galaxy S21 FE 5G firmware
Build G990USQSMIZB2 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 Mar 10, 2026 (method) and has reached
9 regions so far. It raises the bootloader bit from 21 to 22: once installed, the device no longer accepts firmware with bit 21 or lower, so a downgrade to G990USQSLIZA1 is blocked. Samsung still serves this file.
- Model
- SM-G990U
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 22
- First released
- Mar 10, 2026
- Regions
- 9
Rollout timeline by region
The date each region code (CSC) first received G990USQSMIZB2, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
ATT | USA (AT&T) | Mar 10, 2026 | day 0 | G990USQSMIZB2/G990UOYNMIZB2/G990USQSMIZB2 |
AIO | USA (Cricket) | Mar 10, 2026 | day 0 | G990USQSMIZB2/G990UOYNMIZB2/G990USQSMIZB2 |
TMB | USA (T-Mobile) | Mar 12, 2026 | +2 days | G990USQSMIZB2/G990UOYNMIZB2/G990USQSMIZB2 |
TMK | USA (MetroPCS) | Mar 12, 2026 | +2 days | G990USQSMIZB2/G990UOYNMIZB2/G990USQSMIZB2 |
DSA | USA | Mar 13, 2026 | +3 days | G990USQSMIZB2/G990UOYNMIZB2/G990USQSMIZB2 |
DSH | USA | Mar 13, 2026 | +3 days | G990USQSMIZB2/G990UOYNMIZB2/G990USQSMIZB2 |
CCT | USA (Comcast) | Mar 16, 2026 | +6 days | G990USQSMIZB2/G990UOYNMIZB2/G990USQSMIZB2 |
VZW | USA (Verizon) | Mar 16, 2026 | +6 days | G990USQSMIZB2/G990UOYNMIZB2/G990USQSMIZB2 |
USC | USA (US Cellular) | Mar 18, 2026 | +8 days | G990USQSMIZB2/G990UOYNMIZB2/G990USQSMIZB2 |
Download and release notes
samloader download -m SM-G990U -r ATT -v G990USQSMIZB2/G990UOYNMIZB2/G990USQSMIZB2Samsung'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 G990USQSMIZB2.