S948U1UES3AZF1 – Galaxy S26 Ultra firmware
Build S948U1UES3AZF1 is a security update for the Galaxy S26 Ultra (SM-S948U1)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Jun 16, 2026 (method) and has reached
14 regions so far. It raises the bootloader bit from 2 to 3: once installed, the device no longer accepts firmware with bit 2 or lower, so a downgrade to S948U1UES2AZE1 is blocked. Samsung still serves this file.
- Model
- SM-S948U1
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 3
- First released
- Jun 16, 2026
- Regions
- 14
Rollout timeline by region
The date each region code (CSC) first received S948U1UES3AZF1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
TFN | USA (TracFone) | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
TMB | USA (T-Mobile) | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
TMK | USA (MetroPCS) | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
USC | USA (US Cellular) | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
VZW | USA (Verizon) | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
XAA | USA (unlocked) | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
XAR | USA (Cellular South) | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
ACG | USA (C Spire) | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
AIO | USA (Cricket) | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
ATT | USA (AT&T) | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
CCT | USA (Comcast) | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
DSA | USA | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
DSH | USA | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
LRA | USA (Bluegrass) | Jun 16, 2026 | day 0 | S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1 |
Download and release notes
samloader download -m SM-S948U1 -r XAA -v S948U1UES3AZF1/S948U1OYM3AZF1/S948U1UES3AZF1Samsung's release notes and security patch level for this update: SM-S948U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode S948U1UES3AZF1.