S918USQU8GZIF – Galaxy S23 Ultra firmware
Build S918USQU8GZIF is a feature update for the Galaxy S23 Ultra (SM-S918U)
on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 18, 2026 (method) and has reached
9 regions so far. It keeps bootloader bit 8, so downgrading to the previous build S918USQS8FZI1 is still possible. Samsung still serves this file.
- Model
- SM-S918U
- Android
- Android 17
- Type
- Feature
- Bootloader bit
- 8
- First released
- Oct 18, 2026
- Regions
- 9
Rollout timeline by region
The date each region code (CSC) first received S918USQU8GZIF, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
ATT | USA (AT&T) | Oct 18, 2026 | day 0 | S918USQU8GZIF/S918UOYN8GZIF/S918USQU8GZIF |
TMB | USA (T-Mobile) | Oct 18, 2026 | day 0 | S918USQU8GZIF/S918UOYN8GZIF/S918USQU8GZIF |
TMK | USA (MetroPCS) | Oct 18, 2026 | day 0 | S918USQU8GZIF/S918UOYN8GZIF/S918USQU8GZIF |
USC | USA (US Cellular) | Oct 18, 2026 | day 0 | S918USQU8GZIF/S918UOYN8GZIF/S918USQU8GZIF |
DSA | USA | Oct 22, 2026 | +4 days | S918USQU8GZIF/S918UOYN8GZIF/S918USQU8GZIF |
DSH | USA | Oct 22, 2026 | +4 days | S918USQU8GZIF/S918UOYN8GZIF/S918USQU8GZIF |
CCT | USA (Comcast) | Oct 25, 2026 | +7 days | S918USQU8GZIF/S918UOYN8GZIF/S918USQU8GZIF |
VZW | USA (Verizon) | Oct 26, 2026 | +8 days | S918USQU8GZIF/S918UOYN8GZIF/S918USQU8GZIF |
XAA | USA (unlocked) | Oct 26, 2026 | +8 days | S918USQU8GZIF/S918UOYN8GZIF/S918USQU8GZIF |
Download and release notes
samloader download -m SM-S918U -r XAA -v S918USQU8GZIF/S918UOYN8GZIF/S918USQU8GZIFSamsung'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 S918USQU8GZIF.