M556BXXS5DZH1 – Galaxy M55 5G firmware

Build M556BXXS5DZH1 is a security update for the Galaxy M55 5G (SM-M556B) on Android 16 (One UI 8). It first appeared on Samsung's servers on Aug 23, 2026 (method) and has reached 13 regions so far. It keeps bootloader bit 5, so downgrading to the previous build M556BXXS5DZF2 is still possible. Samsung still serves this file.

Model
SM-M556B
Android
Android 16
Type
Security
Bootloader bit
5
First released
Aug 23, 2026
Regions
13

Not yet released in 1 regions that are still on an older build: BKD.

Rollout timeline by region

The date each region code (CSC) first received M556BXXS5DZH1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
SLKSri LankaAug 23, 2026day 0M556BXXS5DZH1/M556BODM5DZH1/M556BXXS5DZH1
BNGBelgiumAug 23, 2026day 0M556BXXS5DZH1/M556BODM5DZH1/M556BXXS5DZH1
INSIndiaAug 23, 2026day 0M556BXXS5DZH1/M556BODM5DZH1/M556BXXS5DZH1
NPBNepalAug 23, 2026day 0M556BXXS5DZH1/M556BODM5DZH1/M556BXXS5DZH1
EGYEgyptAug 26, 2026+3 daysM556BXXS5DZH1/M556BOJM5DZH1/M556BXXS5DZH1
ILOIsraelAug 26, 2026+3 daysM556BXXS5DZH1/M556BOJM5DZH1/M556BXXS5DZH1
MIDMiddle EastAug 26, 2026+3 daysM556BXXS5DZH1/M556BOJM5DZH1/M556BXXS5DZH1
XXVVietnamAug 26, 2026+3 daysM556BXXS5DZH1/M556BOLM5DZH1/M556BXXS5DZH1
CHOChileAug 27, 2026+4 daysM556BXXS5DZH1/M556BOWO5DZH1/M556BXXS5DZH1
COOColombiaAug 27, 2026+4 daysM556BXXS5DZH1/M556BOWO5DZH1/M556BXXS5DZH1
PEOPeruAug 27, 2026+4 daysM556BXXS5DZH1/M556BOWO5DZH1/M556BXXS5DZH1
TPAPanamaAug 27, 2026+4 daysM556BXXS5DZH1/M556BOWO5DZH1/M556BXXS5DZH1
ZTOBrazilAug 27, 2026+4 daysM556BXXS5DZH1/M556BOWO5DZH1/M556BXXS5DZH1

Download and release notes

samloader download -m SM-M556B -r INS -v M556BXXS5DZH1/M556BODM5DZH1/M556BXXS5DZH1

Samsung's release notes and security patch level for this update: SM-M556B / INS on doc.samsungmobile.com. What each part of the build number means: decode M556BXXS5DZH1.