A556BXXSGDZG2 – Galaxy A55 5G firmware

Build A556BXXSGDZG2 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 Jul 19, 2026 (method) and has reached 16 regions so far. It raises the bootloader bit from 15 to 16: once installed, the device no longer accepts firmware with bit 15 or lower, so a downgrade to A556BXXSFDZF4 is blocked. Samsung still serves this file.

Model
SM-A556B
Android
Android 16
Type
Security
Bootloader bit
16
First released
Jul 19, 2026
Regions
16

Rollout timeline by region

The date each region code (CSC) first received A556BXXSGDZG2, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
BOGFrance (Bouygues)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
EUXEurope (Multi-CSC)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
EUYEurope (Multi-CSC)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
EVRUnited Kingdom (EE)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
MEOPortugal (MEO)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
MOBAustria (A1)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
MOTSlovenia (Telekom)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
MSRSerbiaJul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
O2CCzech Republic (O2)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
PLSPoland (Plus)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
PRTPoland (Play)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
SFRFrance (SFR)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
SIMSlovenia (A1)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
SWCSwitzerlandJul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
TOPSerbia/MontenegroJul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2
VIPCroatia (A1)Jul 19, 2026day 0A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2

Download and release notes

samloader download -m SM-A556B -r EUX -v A556BXXSGDZG2/A556BOXMGDZG2/A556BXXSGDZG2

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 A556BXXSGDZG2.