S931USQSDDZJ1 – Galaxy S25 firmware

Build S931USQSDDZJ1 is a security update for the Galaxy S25 (SM-S931U) on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 22, 2026 (method) and has reached 10 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 S931USQUCDZIF is blocked. Samsung still serves this file.

Model
SM-S931U
Android
Android 17
Type
Security
Bootloader bit
13
First released
Oct 22, 2026
Regions
10

Rollout timeline by region

The date each region code (CSC) first received S931USQSDDZJ1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
AIOUSA (Cricket)Oct 22, 2026day 0S931USQSDDZJ1/S931UOYNDDZJ1/S931USQSDDZJ1
ATTUSA (AT&T)Oct 22, 2026day 0S931USQSDDZJ1/S931UOYNDDZJ1/S931USQSDDZJ1
CCTUSA (Comcast)Oct 22, 2026day 0S931USQSDDZJ1/S931UOYNDDZJ1/S931USQSDDZJ1
VZWUSA (Verizon)Oct 22, 2026day 0S931USQSDDZJ1/S931UOYNDDZJ1/S931USQSDDZJ1
XAAUSA (unlocked)Oct 29, 2026+7 daysS931USQSDDZJ1/S931UOYNDDZJ1/S931USQSDDZJ1
DSAUSANov 9, 2026+18 daysS931USQSDDZJ1/S931UOYNDDZJ1/S931USQSDDZJ1
DSHUSANov 9, 2026+18 daysS931USQSDDZJ1/S931UOYNDDZJ1/S931USQSDDZJ1
TMBUSA (T-Mobile)Nov 9, 2026+18 daysS931USQSDDZJ1/S931UOYNDDZJ1/S931USQSDDZJ1
TMKUSA (MetroPCS)Nov 9, 2026+18 daysS931USQSDDZJ1/S931UOYNDDZJ1/S931USQSDDZJ1
USCUSA (US Cellular)Nov 9, 2026+18 daysS931USQSDDZJ1/S931UOYNDDZJ1/S931USQSDDZJ1

Download and release notes

samloader download -m SM-S931U -r XAA -v S931USQSDDZJ1/S931UOYNDDZJ1/S931USQSDDZJ1

Samsung's release notes and security patch level for this update: SM-S931U / XAA on doc.samsungmobile.com. What each part of the build number means: decode S931USQSDDZJ1.