S931U1UESDDZJ1 – Galaxy S25 firmware

Build S931U1UESDDZJ1 is a security update for the Galaxy S25 (SM-S931U1) on Android 17 (One UI 9). It first appeared on Samsung's servers on Oct 26, 2026 (method) and has reached 14 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 S931U1UEUCDZIF is blocked. Samsung still serves this file.

Model
SM-S931U1
Android
Android 17
Type
Security
Bootloader bit
13
First released
Oct 26, 2026
Regions
14

Rollout timeline by region

The date each region code (CSC) first received S931U1UESDDZJ1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Oct 26, 2026day 0S931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
AIOUSA (Cricket)Oct 26, 2026day 0S931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
ATTUSA (AT&T)Oct 26, 2026day 0S931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
CCTUSA (Comcast)Oct 26, 2026day 0S931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
LRAUSA (Bluegrass)Oct 26, 2026day 0S931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
TFNUSA (TracFone)Oct 26, 2026day 0S931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
VZWUSA (Verizon)Oct 26, 2026day 0S931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
XARUSA (Cellular South)Oct 26, 2026day 0S931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
DSAUSANov 9, 2026+14 daysS931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
DSHUSANov 9, 2026+14 daysS931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
TMBUSA (T-Mobile)Nov 9, 2026+14 daysS931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
TMKUSA (MetroPCS)Nov 9, 2026+14 daysS931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
USCUSA (US Cellular)Nov 9, 2026+14 daysS931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1
XAAUSA (unlocked)Nov 9, 2026+14 daysS931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1

Download and release notes

samloader download -m SM-S931U1 -r XAA -v S931U1UESDDZJ1/S931U1OYMDDZJ1/S931U1UESDDZJ1

Samsung's release notes and security patch level for this update: SM-S931U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode S931U1UESDDZJ1.