A256U1UESADZA3 – Galaxy A25 5G firmware

Build A256U1UESADZA3 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 Feb 8, 2026 (method) and has reached 13 regions so far. It raises the bootloader bit from 9 to 10: once installed, the device no longer accepts firmware with bit 9 or lower, so a downgrade to A256U1UES9DYK3 is blocked. Samsung still serves this file.

Model
SM-A256U1
Android
Android 16
Type
Security
Bootloader bit
10
First released
Feb 8, 2026
Regions
13

Rollout timeline by region

The date each region code (CSC) first received A256U1UESADZA3, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Feb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3
AIOUSA (Cricket)Feb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3
ATTUSA (AT&T)Feb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3
CCTUSA (Comcast)Feb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3
DSAUSAFeb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3
DSHUSAFeb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3
LRAUSA (Bluegrass)Feb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3
TMBUSA (T-Mobile)Feb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3
TMKUSA (MetroPCS)Feb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3
USCUSA (US Cellular)Feb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3
VZWUSA (Verizon)Feb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3
XAAUSA (unlocked)Feb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3
XARUSA (Cellular South)Feb 8, 2026day 0A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3

Download and release notes

samloader download -m SM-A256U1 -r XAA -v A256U1UESADZA3/A256U1OYMADZA3/A256U1UESADZA3

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 A256U1UESADZA3.