Galaxy M55s 5G SM-M558B updates & firmware

This page tracks every software update Samsung's update servers list for the Samsung Galaxy M55s 5G (SM-M558B). The latest stable build is M558BXXS3DZH1 (Android 16, security update), first released on Aug 31, 2026. Samsung has published 14 stable builds for this model since Sep 15, 2024: 9 security and 5 feature updates, from Android 14 to Android 16. The current bootloader (binary) version is 3. A device on bit 3 only accepts firmware with bit 3 or higher – see downgrading and the bootloader bit.

Rollout: build M558BXXS3DZH1 (Android 16 (One UI 8)) is live in all 1 regions, first released on Aug 31, 2026 in INS (India). In India (INS) the latest official firmware (flash file) is M558BXXS3DZH1 from Aug 31, 2026.

Latest build: M558BXXS3DZH1
Released: Aug 31, 2026
Android: Android 16
Bootloader bit: 3
Regions: 1
Stable builds: 14

Update policy

Samsung promised 4 major Android upgrades and 5 years of security updates for the Galaxy M55s 5G, counted from its launch in September 2024 with Android 14. That makes Android 18 (One UI 10) the last major version and security updates continue until about September 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: September 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.

CSC	Region	Latest build	Android	Released	Builds
`INS`	India	`M558BXXS3DZH1`	Android 16	Aug 31, 2026	14

Firmware history (14 builds)

Every stable build (PDA version) Samsung has published for the SM-M558B, 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)	Released	Android	Type	Bit	Regions	File
`M558BXXS3DZH1`	Aug 31, 2026	Android 16	Security	3	1	on server
`M558BXXS3DZF2`	Jun 23, 2026	Android 16	Security	3	1	on server
`M558BXXU3DZE3`	Jun 1, 2026	Android 16	Feature	3	1	on server
`M558BXXS3CZB4`	Mar 10, 2026	Android 16	Security	3	1	on server
`M558BXXS2CYL1`	Dec 29, 2025	Android 16	Security	2	1	on server
`M558BXXU2CYJ4`	Oct 26, 2025	Android 16	Feature	2	1	on server
`M558BXXS2BYH2`	Aug 20, 2025	Android 15	Security	2	1	on server
`M558BXXU2BYE7`	May 28, 2025	Android 15	Feature	2	1	on server
`M558BXXU2AYB3`	Mar 3, 2025	Android 14	Feature	2	1	on server
`M558BXXS2AXL1`	Jan 15, 2025	Android 14	Security	2	1	on server
`M558BXXS2AXK5`	Nov 27, 2024	Android 14	Security	2	1	on server
`M558BXXS1AXJ9`	Nov 20, 2024	Android 14	Security	1	1	on server
`M558BXXS1AXJ3`	Oct 28, 2024	Android 14	Security	1	1	on server
`M558BXXU1AXI1`	Sep 15, 2024	Android 14	Feature	1	1	on server

How to download SM-M558B 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-M558B -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-M558B / 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).