A356BXXS9CZB6 – Galaxy A35 5G firmware

Build A356BXXS9CZB6 is a security update for the Galaxy A35 5G (SM-A356B) on Android 16 (One UI 8). It first appeared on Samsung's servers on Mar 8, 2026 (method) and has reached 16 regions so far. It raises the bootloader bit from 8 to 9: once installed, the device no longer accepts firmware with bit 8 or lower, so a downgrade to A356BXXS8CZA4 is blocked. Samsung still serves this file.

Model
SM-A356B
Android
Android 16
Type
Security
Bootloader bit
9
First released
Mar 8, 2026
Regions
16

Rollout timeline by region

The date each region code (CSC) first received A356BXXS9CZB6, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
BOGFrance (Bouygues)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
EUXEurope (Multi-CSC)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
EUYEurope (Multi-CSC)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
EVRUnited Kingdom (EE)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
MEOPortugal (MEO)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
MOBAustria (A1)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
MOTSlovenia (Telekom)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
MSRSerbiaMar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
O2CCzech Republic (O2)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
PLSPoland (Plus)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
PRTPoland (Play)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
SFRFrance (SFR)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
SIMSlovenia (A1)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
SWCSwitzerlandMar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
TOPSerbia/MontenegroMar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6
VIPCroatia (A1)Mar 8, 2026day 0A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6

Download and release notes

samloader download -m SM-A356B -r EUX -v A356BXXS9CZB6/A356BOXM9CZB6/A356BXXS9CZB6

Samsung's release notes and security patch level for this update: SM-A356B / EUX on doc.samsungmobile.com. What each part of the build number means: decode A356BXXS9CZB6.