A546USQSMFZH3 – Galaxy A54 5G firmware

Build A546USQSMFZH3 is a security update for the Galaxy A54 5G (SM-A546U) on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 2, 2026 (method) and has reached 8 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 A546USQSLFZG3 is blocked. Samsung still serves this file.

Model
SM-A546U
Android
Android 16
Type
Security
Bootloader bit
22
First released
Sep 2, 2026
Regions
8

Rollout timeline by region

The date each region code (CSC) first received A546USQSMFZH3, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
AIOUSA (Cricket)Sep 2, 2026day 0A546USQSMFZH3/A546UOYNMFZH3/A546USQSMFZH3
ATTUSA (AT&T)Sep 2, 2026day 0A546USQSMFZH3/A546UOYNMFZH3/A546USQSMFZH3
DSAUSASep 3, 2026+1 dayA546USQSMFZH3/A546UOYNMFZH3/A546USQSMFZH3
DSHUSASep 3, 2026+1 dayA546USQSMFZH3/A546UOYNMFZH3/A546USQSMFZH3
TMBUSA (T-Mobile)Sep 3, 2026+1 dayA546USQSMFZH3/A546UOYNMFZH3/A546USQSMFZH3
TMKUSA (MetroPCS)Sep 3, 2026+1 dayA546USQSMFZH3/A546UOYNMFZH3/A546USQSMFZH3
USCUSA (US Cellular)Sep 3, 2026+1 dayA546USQSMFZH3/A546UOYNMFZH3/A546USQSMFZH3
CCTUSA (Comcast)Sep 8, 2026+6 daysA546USQSMFZH3/A546UOYNMFZH3/A546USQSMFZH3

Download and release notes

samloader download -m SM-A546U -r AIO -v A546USQSMFZH3/A546UOYNMFZH3/A546USQSMFZH3

Samsung's release notes and security patch level for this update: SM-A546U / AIO on doc.samsungmobile.com. What each part of the build number means: decode A546USQSMFZH3.