A156U1UESBDZDD – Galaxy A15 5G firmware

Build A156U1UESBDZDD is a security update for the Galaxy A15 5G (SM-A156U1) on Android 16 (One UI 8). It first appeared on Samsung's servers on May 14, 2026 (method) and has reached 13 regions so far. It raises the bootloader bit from 10 to 11: once installed, the device no longer accepts firmware with bit 10 or lower, so a downgrade to A156U1UESADZB5 is blocked. Samsung still serves this file.

Model
SM-A156U1
Android
Android 16
Type
Security
Bootloader bit
11
First released
May 14, 2026
Regions
13

Rollout timeline by region

The date each region code (CSC) first received A156U1UESBDZDD, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)May 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD
AIOUSA (Cricket)May 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD
ATTUSA (AT&T)May 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD
CCTUSA (Comcast)May 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD
DSAUSAMay 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD
DSHUSAMay 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD
LRAUSA (Bluegrass)May 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD
TMBUSA (T-Mobile)May 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD
TMKUSA (MetroPCS)May 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD
USCUSA (US Cellular)May 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD
VZWUSA (Verizon)May 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD
XAAUSA (unlocked)May 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD
XARUSA (Cellular South)May 14, 2026day 0A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD

Download and release notes

samloader download -m SM-A156U1 -r XAA -v A156U1UESBDZDD/A156U1OYMBDZDD/A156U1UESBDZDD

Samsung's release notes and security patch level for this update: SM-A156U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode A156U1UESBDZDD.