A546USQSNFZI2 – Galaxy A54 5G firmware

Build A546USQSNFZI2 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 23, 2026 (method) and has reached 8 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 A546USQSMFZH3 is blocked. Samsung still serves this file.

Model
SM-A546U
Android
Android 16
Type
Security
Bootloader bit
23
First released
Sep 23, 2026
Regions
8

Rollout timeline by region

The date each region code (CSC) first received A546USQSNFZI2, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
AIOUSA (Cricket)Sep 23, 2026day 0A546USQSNFZI2/A546UOYNNFZI2/A546USQSNFZI2
ATTUSA (AT&T)Sep 23, 2026day 0A546USQSNFZI2/A546UOYNNFZI2/A546USQSNFZI2
TMBUSA (T-Mobile)Sep 24, 2026+1 dayA546USQSNFZI2/A546UOYNNFZI2/A546USQSNFZI2
TMKUSA (MetroPCS)Sep 24, 2026+1 dayA546USQSNFZI2/A546UOYNNFZI2/A546USQSNFZI2
USCUSA (US Cellular)Sep 24, 2026+1 dayA546USQSNFZI2/A546UOYNNFZI2/A546USQSNFZI2
DSAUSASep 25, 2026+2 daysA546USQSNFZI2/A546UOYNNFZI2/A546USQSNFZI2
DSHUSASep 25, 2026+2 daysA546USQSNFZI2/A546UOYNNFZI2/A546USQSNFZI2
CCTUSA (Comcast)Sep 28, 2026+5 daysA546USQSNFZI2/A546UOYNNFZI2/A546USQSNFZI2

Download and release notes

samloader download -m SM-A546U -r AIO -v A546USQSNFZI2/A546UOYNNFZI2/A546USQSNFZI2

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 A546USQSNFZI2.