S938U1UESCCZF9 – Galaxy S25 Ultra firmware
Build S938U1UESCCZF9 is a security update for the Galaxy S25 Ultra (SM-S938U1)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Aug 31, 2026 (method) and has reached
14 regions so far. It raises the bootloader bit from 11 to 12: once installed, the device no longer accepts firmware with bit 11 or lower, so a downgrade to S938U1UESBCZF5 is blocked. Samsung still serves this file.
- Model
- SM-S938U1
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 12
- First released
- Aug 31, 2026
- Regions
- 14
Rollout timeline by region
The date each region code (CSC) first received S938U1UESCCZF9, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
ACG | USA (C Spire) | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
AIO | USA (Cricket) | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
ATT | USA (AT&T) | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
CCT | USA (Comcast) | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
DSA | USA | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
DSH | USA | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
LRA | USA (Bluegrass) | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
TFN | USA (TracFone) | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
TMB | USA (T-Mobile) | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
TMK | USA (MetroPCS) | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
USC | USA (US Cellular) | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
VZW | USA (Verizon) | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
XAA | USA (unlocked) | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
XAR | USA (Cellular South) | Aug 31, 2026 | day 0 | S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9 |
Download and release notes
samloader download -m SM-S938U1 -r XAA -v S938U1UESCCZF9/S938U1OYMCCZF9/S938U1UESCCZF9Samsung's release notes and security patch level for this update: SM-S938U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode S938U1UESCCZF9.