A256U1UESCDZD7 – Galaxy A25 5G firmware

Build A256U1UESCDZD7 is a security update for the Galaxy A25 5G (SM-A256U1) on Android 16 (One UI 8). It first appeared on Samsung's servers on May 3, 2026 (method) and has reached 13 regions so far. It raises the bootloader bit from 11 to 12: once installed, the device no longer accepts firmware with bit 11 or lower, so a downgrade to A256U1UESBDZB2 is blocked. Samsung still serves this file.

Model
SM-A256U1
Android
Android 16
Type
Security
Bootloader bit
12
First released
May 3, 2026
Regions
13

Rollout timeline by region

The date each region code (CSC) first received A256U1UESCDZD7, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)May 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7
AIOUSA (Cricket)May 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7
ATTUSA (AT&T)May 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7
CCTUSA (Comcast)May 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7
DSAUSAMay 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7
DSHUSAMay 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7
LRAUSA (Bluegrass)May 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7
TMBUSA (T-Mobile)May 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7
TMKUSA (MetroPCS)May 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7
USCUSA (US Cellular)May 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7
VZWUSA (Verizon)May 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7
XAAUSA (unlocked)May 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7
XARUSA (Cellular South)May 3, 2026day 0A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7

Download and release notes

samloader download -m SM-A256U1 -r XAA -v A256U1UESCDZD7/A256U1OYMCDZD7/A256U1UESCDZD7

Samsung's release notes and security patch level for this update: SM-A256U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode A256U1UESCDZD7.