Samsung Galaxy M55s 5G (SM-M558B) Firmware Overview
What is the latest SM-M558B firmware?
M558BXXS3DZH1, released August 17, 2026 with Android 16. It is a security update on bootloader binary 3. The archive holds 13 official builds across 1 region (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy M55s 5G still getting updates?
Yes. The newest build is from August 2026.
Which Android versions did it get?
The SM-M558B builds in the archive run Android 14 to 16. The earliest build we have for each version:
- Android 16: M558BXXU2CYJ4 (Oct 2025), 6 builds in total
- Android 15: M558BXXU2BYE7 (May 2025), 2 builds in total
- Android 14: M558BXXS1AXJ3 (Oct 2024), 5 builds in total
Can I downgrade the SM-M558B firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. In the archive the binary of this model rose from 1 to 3:
- Binary 3 — since Feb 2026
- Binary 2 — since Nov 2024
- Binary 1 — since Oct 2024
A phone already on binary 3 rejects builds with a lower binary in Odin ("SW REV CHECK FAIL"), so it can go back to an earlier Android version only if that version has a binary 3 build. How to read a build number.
All SM-M558B firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
M558BXXS3DZH1
Security update
|
3 | INS | 16 |
2026-08-17 | Download |
|
M558BXXS3DZF2
Security update
|
3 | INS | 16 |
2026-06-15 | Download |
|
M558BXXU3DZE3
Feature update
|
3 | INS | 16 |
2026-05-13 | Download |
|
M558BXXS3CZB4
Security update
|
3 | INS | 16 |
2026-03-10 | Download |
|
M558BXXS2CYL1
Security update
|
2 | INS | 16 |
2025-12-30 | Download |
|
M558BXXU2CYJ4
Feature update
|
2 | INS | 16 |
2025-10-27 | Download |
|
M558BXXS2BYH2
Security update
|
2 | INS | 15 |
2025-08-21 | Download |
|
M558BXXU2BYE7
Feature update
|
2 | INS | 15 |
2025-05-29 | Download |
|
M558BXXU2AYB3
Feature update
|
2 | INS | 14 |
2025-03-04 | Download |
|
M558BXXS2AXL1
Security update
|
2 | INS | 14 |
2025-01-10 | Download |
|
M558BXXS2AXK5
Security update
|
2 | INS | 14 |
2024-11-22 | Download |
|
M558BXXS1AXJ9
Security update
|
1 | INS | 14 |
2024-11-14 | Download |
|
M558BXXS1AXJ3
Security update
|
1 | INS | 14 |
2024-10-16 | Download |
How to Flash SM-M558B Firmware
Put the Samsung Galaxy M55s 5G into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Pick a build with Bit 3 or higher if your phone is already on the latest firmware. Use HOME_CSC to keep your data, CSC for a full wipe.