A546U1UESMFZH3 – Galaxy A54 5G firmware

Build A546U1UESMFZH3 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 7, 2026 (method) and has reached 13 regions so far. It raises the bootloader bit from 21 to 22: once installed, the device no longer accepts firmware with bit 21 or lower, so a downgrade to A546U1UESLFZG3 is blocked. Samsung still serves this file.

Model
SM-A546U1
Android
Android 16
Type
Security
Bootloader bit
22
First released
Sep 7, 2026
Regions
13

Rollout timeline by region

The date each region code (CSC) first received A546U1UESMFZH3, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Sep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3
AIOUSA (Cricket)Sep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3
ATTUSA (AT&T)Sep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3
CCTUSA (Comcast)Sep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3
DSAUSASep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3
DSHUSASep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3
LRAUSA (Bluegrass)Sep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3
TMBUSA (T-Mobile)Sep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3
TMKUSA (MetroPCS)Sep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3
USCUSA (US Cellular)Sep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3
VZWUSA (Verizon)Sep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3
XAAUSA (unlocked)Sep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3
XARUSA (Cellular South)Sep 7, 2026day 0A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3

Download and release notes

samloader download -m SM-A546U1 -r XAA -v A546U1UESMFZH3/A546U1OYMMFZH3/A546U1UESMFZH3

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 A546U1UESMFZH3.