S948USQS4AZG3 – Galaxy S26 Ultra firmware

Build S948USQS4AZG3 is a security update for the Galaxy S26 Ultra (SM-S948U) on Android 16 (One UI 8). It first appeared on Samsung's servers on Jul 12, 2026 (method) and has reached 9 regions so far. It raises the bootloader bit from 3 to 4: once installed, the device no longer accepts firmware with bit 3 or lower, so a downgrade to S948USQS3AZF1 is blocked. Samsung still serves this file.

Model
SM-S948U
Android
Android 16
Type
Security
Bootloader bit
4
First released
Jul 12, 2026
Regions
9

Rollout timeline by region

The date each region code (CSC) first received S948USQS4AZG3, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
TMBUSA (T-Mobile)Jul 12, 2026day 0S948USQS4AZG3/S948UOYN4AZG3/S948USQS4AZG3
TMKUSA (MetroPCS)Jul 12, 2026day 0S948USQS4AZG3/S948UOYN4AZG3/S948USQS4AZG3
VZWUSA (Verizon)Jul 12, 2026day 0S948USQS4AZG3/S948UOYN4AZG3/S948USQS4AZG3
AIOUSA (Cricket)Jul 13, 2026+1 dayS948USQS4AZG3/S948UOYN4AZG3/S948USQS4AZG3
ATTUSA (AT&T)Jul 13, 2026+1 dayS948USQS4AZG3/S948UOYN4AZG3/S948USQS4AZG3
CCTUSA (Comcast)Jul 14, 2026+2 daysS948USQS4AZG3/S948UOYN4AZG3/S948USQS4AZG3
DSAUSAJul 14, 2026+2 daysS948USQS4AZG3/S948UOYN4AZG3/S948USQS4AZG3
DSHUSAJul 14, 2026+2 daysS948USQS4AZG3/S948UOYN4AZG3/S948USQS4AZG3
USCUSA (US Cellular)Jul 15, 2026+3 daysS948USQS4AZG3/S948UOYN4AZG3/S948USQS4AZG3

Download and release notes

samloader download -m SM-S948U -r TMB -v S948USQS4AZG3/S948UOYN4AZG3/S948USQS4AZG3

Samsung's release notes and security patch level for this update: SM-S948U / TMB on doc.samsungmobile.com. What each part of the build number means: decode S948USQS4AZG3.