Galaxy M55 5G SM-M556B updates & firmware

This page tracks every software update Samsung's update servers list for the Samsung Galaxy M55 5G (SM-M556B). The latest stable build is M556BXXS5DZH1 (Android 16, security update), first released on Aug 23, 2026. Samsung has published 29 stable builds for this model since Mar 12, 2024: 15 security and 14 feature updates, from Android 14 to Android 16. The current bootloader (binary) version is 5. A device on bit 5 only accepts firmware with bit 5 or higher – see downgrading and the bootloader bit.

Rollout: build M556BXXS5DZH1 (Android 16 (One UI 8)) is live in 13 of 14 regions, first released on Aug 23, 2026 in SLK (Sri Lanka). Still waiting: BKD. In India (INS) the latest official firmware (flash file) is M556BXXS5DZH1 from Aug 23, 2026.

Latest build
M556BXXS5DZH1
Released
Aug 23, 2026
Android
Android 16
Bootloader bit
5
Regions
14
Stable builds
29

Update policy

Samsung promised 4 major Android upgrades and 5 years of security updates for the Galaxy M55 5G, counted from its launch in February 2024 with Android 14. That makes Android 18 (One UI 10) the last major version and security updates continue until about February 2029. It is currently on Android 16 (One UI 8), so 2 major upgrades are still to come.

OS upgrades promised
4
Security updates
5 years
Last major version
Android 18 (One UI 10)
Security support until
February 2029
Current version
Android 16 (One UI 8)
Status
Supported

Source: Samsung. Samsung counts from the global launch and does not publish exact end dates; the dates above are launch month plus the promised years.

Compare all models: Samsung update policy by model.

Latest firmware by region (CSC)

Samsung builds firmware per region code (CSC). Pick the code that matches your device – it is shown under Settings › About phone › Software information › Service provider software version. Follow a code for its complete history.

CSCRegionLatest buildAndroidReleasedBuilds
BKDBangladeshM556BXXU1AXC1Android 14Apr 24, 20242
BNGBelgiumM556BXXS5DZH1Android 16Aug 23, 202617
CHOChileM556BXXS5DZH1Android 16Aug 27, 202618
COOColombiaM556BXXS5DZH1Android 16Aug 27, 202614
EGYEgyptM556BXXS5DZH1Android 16Aug 26, 202618
ILOIsraelM556BXXS5DZH1Android 16Aug 26, 202618
INSIndiaM556BXXS5DZH1Android 16Aug 23, 202618
MIDMiddle EastM556BXXS5DZH1Android 16Aug 26, 202618
NPBNepalM556BXXS5DZH1Android 16Aug 23, 202618
PEOPeruM556BXXS5DZH1Android 16Aug 27, 202618
SLKSri LankaM556BXXS5DZH1Android 16Aug 23, 202618
TPAPanamaM556BXXS5DZH1Android 16Aug 27, 202614
XXVVietnamM556BXXS5DZH1Android 16Aug 26, 202618
ZTOBrazilM556BXXS5DZH1Android 16Aug 27, 202618

Firmware history (29 builds)

Every stable build (PDA version) Samsung has published for the SM-M556B, newest first. “Released” is the earliest date the build appeared on Samsung's servers in any region (how dates work). “pulled” means Samsung no longer serves the file for that build, usually because newer builds replaced it (details).

Build (PDA)ReleasedAndroidTypeBitRegionsFile
M556BXXS5DZH1Aug 23, 2026Android 16Security513on server
M556BXXS5DZF2Jun 17, 2026Android 16Security513on server
M556BXXU5DZE3May 27, 2026Android 16Feature513on server
M556BXXS5CZB4Mar 3, 2026Android 16Security513on server
M556BXXS4CYL1Dec 22, 2025Android 16Security413on server
M556BXXU4CYJ4Oct 26, 2025Android 16Feature413on server
M556BXXS4BYH2Aug 18, 2025Android 15Security413on server
M556BXXU4BYE7May 25, 2025Android 15Feature413on server
M556BXXU4AYB4Feb 27, 2025Android 14Feature45on server
M556BXXU4AYB3Feb 23, 2025Android 14Feature48on server
M556BXXS4AYA1Jan 28, 2025Android 14Security45on server
M556BXXS4AXL1Jan 13, 2025Android 14Security48on server
M556BXXS4AXK6Dec 18, 2024Android 14Security45on server
M556BXXU3AXJDDec 18, 2024Android 14Feature35on server
M556BXXS4AXK5Nov 26, 2024Android 14Security48on server
M556BXXS3AXJCNov 13, 2024Android 14Security31on server
M556BXXS3AXJBNov 10, 2024Android 14Security31on server
M556BXXU3AXJANov 6, 2024Android 14Feature38on server
M556BXXS3AXJ2Nov 4, 2024Android 14Security33on server
M556BXXU3AXJ2Oct 29, 2024Android 14Feature31on server
M556BXXS3AXJ6Oct 22, 2024Android 14Security34on server
M556BXXU3AXI1Oct 22, 2024Android 14Feature31on server
M556BXXS3AXJ3Oct 20, 2024Android 14Security34on server
M556BXXS3AXH1Aug 20, 2024Android 14Security37on server
M556BXXU3AXG7Aug 5, 2024Android 14Feature34on server
M556BXXU2AXE8Jun 4, 2024Android 14Feature211on server
M556BXXU2AXE5May 22, 2024Android 14Feature211on server
M556BXXU1AXD7Apr 24, 2024Android 14Feature112on server
M556BXXU1AXC1Mar 12, 2024Android 14Feature111on server

How to download SM-M556B firmware

We do not host firmware. Download it directly from Samsung's servers with a free open-source tool, for example samloader:

samloader download -m SM-M556B -r INS

Replace INS with your region code. Step-by-step instructions, including a graphical alternative: How to download Samsung firmware.

Changelog and security patch level

Samsung publishes the release notes for each update, including the security patch level, on its own site. They are listed per region – for example SM-M556B / INS release notes on doc.samsungmobile.com. Each region page here links to the notes for that code. We don't show the patch level ourselves because Samsung's update servers don't report it (why).