A546BXXSMFZH5 – Galaxy A54 5G firmware

Build A546BXXSMFZH5 is a security update for the Galaxy A54 5G (SM-A546B) on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 7, 2026 (method) and has reached 18 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 A546BXXSLFZG3 is blocked. Samsung still serves this file.

Model
SM-A546B
Android
Android 16
Type
Security
Bootloader bit
22
First released
Sep 7, 2026
Regions
18

Rollout timeline by region

The date each region code (CSC) first received A546BXXSMFZH5, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
BOGFrance (Bouygues)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
BTBUnited Kingdom (BT)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
EUXEurope (Multi-CSC)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
EUYEurope (Multi-CSC)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
EVRUnited Kingdom (EE)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
MEOPortugal (MEO)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
MOBAustria (A1)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
MOTSlovenia (Telekom)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
MSRSerbiaSep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
O2CCzech Republic (O2)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
PLSPoland (Plus)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
PRTPoland (Play)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
SFRFrance (SFR)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
SIMSlovenia (A1)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
SWCSwitzerlandSep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
TIMItaly (TIM)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
TOPSerbia/MontenegroSep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1
VIPCroatia (A1)Sep 7, 2026day 0A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1

Download and release notes

samloader download -m SM-A546B -r EUX -v A546BXXSMFZH5/A546BOXMMFZH5/A546BXXSMFZH1

Samsung's release notes and security patch level for this update: SM-A546B / EUX on doc.samsungmobile.com. What each part of the build number means: decode A546BXXSMFZH5.