G998USQSJHZB1 – Galaxy S21 Ultra 5G firmware
Build G998USQSJHZB1 is a security update for the Galaxy S21 Ultra 5G (SM-G998U)
on Android 15 (One UI 7). It first appeared on Samsung's servers on Mar 17, 2026 (method) and has reached
6 regions so far. It keeps bootloader bit 19, so downgrading to the previous build G998USQSJHZAA is still possible. Samsung still serves this file.
- Model
- SM-G998U
- Android
- Android 15
- Type
- Security
- Bootloader bit
- 19
- First released
- Mar 17, 2026
- Regions
- 6
Rollout timeline by region
The date each region code (CSC) first received G998USQSJHZB1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
ATT | USA (AT&T) | Mar 17, 2026 | day 0 | G998USQSJHZB1/G998UOYNJHZB1/G998USQSJHZB1 |
CCT | USA (Comcast) | Mar 18, 2026 | +1 day | G998USQSJHZB1/G998UOYNJHZB1/G998USQSJHZB1 |
SPR | USA (Sprint) | Mar 18, 2026 | +1 day | G998USQSJHZB1/G998UOYNJHZB1/G998USQSJHZB1 |
TMB | USA (T-Mobile) | Mar 18, 2026 | +1 day | G998USQSJHZB1/G998UOYNJHZB1/G998USQSJHZB1 |
VZW | USA (Verizon) | Mar 22, 2026 | +5 days | G998USQSJHZB1/G998UOYNJHZB1/G998USQSJHZB1 |
USC | USA (US Cellular) | Mar 25, 2026 | +8 days | G998USQSJHZB1/G998UOYNJHZB1/G998USQSJHZB1 |
Download and release notes
samloader download -m SM-G998U -r ATT -v G998USQSJHZB1/G998UOYNJHZB1/G998USQSJHZB1Samsung's release notes and security patch level for this update: SM-G998U / ATT on doc.samsungmobile.com. What each part of the build number means: decode G998USQSJHZB1.