A556BXXSFDZF4 – Galaxy A55 5G firmware

Build A556BXXSFDZF4 is a security update for the Galaxy A55 5G (SM-A556B) on Android 16 (One UI 8). It first appeared on Samsung's servers on Jun 28, 2026 (method) and has reached 16 regions so far. It raises the bootloader bit from 14 to 15: once installed, the device no longer accepts firmware with bit 14 or lower, so a downgrade to A556BXXUEDZE4 is blocked. Samsung still serves this file.

Model
SM-A556B
Android
Android 16
Type
Security
Bootloader bit
15
First released
Jun 28, 2026
Regions
16

Rollout timeline by region

The date each region code (CSC) first received A556BXXSFDZF4, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
BOGFrance (Bouygues)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
EUXEurope (Multi-CSC)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
EUYEurope (Multi-CSC)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
EVRUnited Kingdom (EE)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
MEOPortugal (MEO)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
MOBAustria (A1)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
MOTSlovenia (Telekom)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
MSRSerbiaJun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
O2CCzech Republic (O2)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
PLSPoland (Plus)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
PRTPoland (Play)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
SFRFrance (SFR)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
SIMSlovenia (A1)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
SWCSwitzerlandJun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
TOPSerbia/MontenegroJun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4
VIPCroatia (A1)Jun 28, 2026day 0A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4

Download and release notes

samloader download -m SM-A556B -r EUX -v A556BXXSFDZF4/A556BOXMFDZF4/A556BXXSFDZF4

Samsung's release notes and security patch level for this update: SM-A556B / EUX on doc.samsungmobile.com. What each part of the build number means: decode A556BXXSFDZF4.