S938USQSDDZJ1 – Galaxy S25 Ultra firmware

Build S938USQSDDZJ1 is a security update for the Galaxy S25 Ultra (SM-S938U) on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 22, 2026 (method) and has reached 9 regions so far. It raises the bootloader bit from 12 to 13: once installed, the device no longer accepts firmware with bit 12 or lower, so a downgrade to S938USQUCDZIF is blocked. Samsung still serves this file.

Model
SM-S938U
Android
Android 17
Type
Security
Bootloader bit
13
First released
Oct 22, 2026
Regions
9

Rollout timeline by region

The date each region code (CSC) first received S938USQSDDZJ1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ATTUSA (AT&T)Oct 22, 2026day 0S938USQSDDZJ1/S938UOYNDDZJ1/S938USQSDDZJ1
CCTUSA (Comcast)Oct 22, 2026day 0S938USQSDDZJ1/S938UOYNDDZJ1/S938USQSDDZJ1
VZWUSA (Verizon)Oct 22, 2026day 0S938USQSDDZJ1/S938UOYNDDZJ1/S938USQSDDZJ1
XAAUSA (unlocked)Oct 29, 2026+7 daysS938USQSDDZJ1/S938UOYNDDZJ1/S938USQSDDZJ1
DSAUSANov 9, 2026+18 daysS938USQSDDZJ1/S938UOYNDDZJ1/S938USQSDDZJ1
DSHUSANov 9, 2026+18 daysS938USQSDDZJ1/S938UOYNDDZJ1/S938USQSDDZJ1
TMBUSA (T-Mobile)Nov 9, 2026+18 daysS938USQSDDZJ1/S938UOYNDDZJ1/S938USQSDDZJ1
TMKUSA (MetroPCS)Nov 9, 2026+18 daysS938USQSDDZJ1/S938UOYNDDZJ1/S938USQSDDZJ1
USCUSA (US Cellular)Nov 9, 2026+18 daysS938USQSDDZJ1/S938UOYNDDZJ1/S938USQSDDZJ1

Download and release notes

samloader download -m SM-S938U -r XAA -v S938USQSDDZJ1/S938UOYNDDZJ1/S938USQSDDZJ1

Samsung's release notes and security patch level for this update: SM-S938U / XAA on doc.samsungmobile.com. What each part of the build number means: decode S938USQSDDZJ1.