A546U1UESNFZI2 – Galaxy A54 5G firmware

Build A546U1UESNFZI2 is a security update for the Galaxy A54 5G (SM-A546U1) on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 28, 2026 (method) and has reached 13 regions so far. It raises the bootloader bit from 22 to 23: once installed, the device no longer accepts firmware with bit 22 or lower, so a downgrade to A546U1UESMFZH3 is blocked. Samsung still serves this file.

Model
SM-A546U1
Android
Android 16
Type
Security
Bootloader bit
23
First released
Sep 28, 2026
Regions
13

Rollout timeline by region

The date each region code (CSC) first received A546U1UESNFZI2, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Sep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2
AIOUSA (Cricket)Sep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2
ATTUSA (AT&T)Sep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2
CCTUSA (Comcast)Sep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2
DSAUSASep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2
DSHUSASep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2
LRAUSA (Bluegrass)Sep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2
TMBUSA (T-Mobile)Sep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2
TMKUSA (MetroPCS)Sep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2
USCUSA (US Cellular)Sep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2
VZWUSA (Verizon)Sep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2
XAAUSA (unlocked)Sep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2
XARUSA (Cellular South)Sep 28, 2026day 0A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2

Download and release notes

samloader download -m SM-A546U1 -r XAA -v A546U1UESNFZI2/A546U1OYMNFZI2/A546U1UESNFZI2

Samsung's release notes and security patch level for this update: SM-A546U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode A546U1UESNFZI2.