S918USQS8FZH3 – Galaxy S23 Ultra firmware
Build S918USQS8FZH3 is a security update for the Galaxy S23 Ultra (SM-S918U)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 1, 2026 (method) and has reached
9 regions so far. It keeps bootloader bit 8, so downgrading to the previous build S918USQS8FZG1 is still possible. Samsung still serves this file.
- Model
- SM-S918U
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 8
- First released
- Sep 1, 2026
- Regions
- 9
Rollout timeline by region
The date each region code (CSC) first received S918USQS8FZH3, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
ATT | USA (AT&T) | Sep 1, 2026 | day 0 | S918USQS8FZH3/S918UOYN8FZH3/S918USQS8FZH3 |
CCT | USA (Comcast) | Sep 1, 2026 | day 0 | S918USQS8FZH3/S918UOYN8FZH3/S918USQS8FZH3 |
VZW | USA (Verizon) | Sep 1, 2026 | day 0 | S918USQS8FZH3/S918UOYN8FZH3/S918USQS8FZH3 |
DSA | USA | Sep 2, 2026 | +1 day | S918USQS8FZH3/S918UOYN8FZH3/S918USQS8FZH3 |
DSH | USA | Sep 2, 2026 | +1 day | S918USQS8FZH3/S918UOYN8FZH3/S918USQS8FZH3 |
TMB | USA (T-Mobile) | Sep 2, 2026 | +1 day | S918USQS8FZH3/S918UOYN8FZH3/S918USQS8FZH3 |
TMK | USA (MetroPCS) | Sep 2, 2026 | +1 day | S918USQS8FZH3/S918UOYN8FZH3/S918USQS8FZH3 |
USC | USA (US Cellular) | Sep 2, 2026 | +1 day | S918USQS8FZH3/S918UOYN8FZH3/S918USQS8FZH3 |
XAA | USA (unlocked) | Sep 2, 2026 | +1 day | S918USQS8FZH3/S918UOYN8FZH3/S918USQS8FZH3 |
Download and release notes
samloader download -m SM-S918U -r XAA -v S918USQS8FZH3/S918UOYN8FZH3/S918USQS8FZH3Samsung's release notes and security patch level for this update: SM-S918U / XAA on doc.samsungmobile.com. What each part of the build number means: decode S918USQS8FZH3.