Samsung Galaxy M55 5G (SM-M556B) Firmware Overview
What is the latest SM-M556B firmware?
M556BXXS5DZH1, released August 18, 2026 with Android 16. It is a security update on bootloader binary 5. The archive holds 50 official builds across 15 regions (CSC).
Is the Samsung Galaxy M55 5G still getting updates?
Yes. The newest build is from August 2026, and 15 of 15 regions already have a build from that month; the rest usually follow within a few weeks.
Can I downgrade the SM-M556B firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. In the archive the binary of this model rose from 4 to 5:
- Binary 5 — since Feb 2026
- Binary 4 — since Dec 2025
A phone already on binary 5 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 5 build. How to read a build number.
All SM-M556B firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
M556BXXS5DZH1
Security update
|
5 | EGY | 16 |
2026-08-18 | Download |
|
M556BXXS5DZH1
Security update
|
5 | XXV | 16 |
2026-08-18 | Download |
|
M556BXXS5DZH1
Security update
|
5 | ILO | 16 |
2026-08-18 | Download |
|
M556BXXS5DZH1
Security update
|
5 | ILP | 16 |
2026-08-18 | Download |
|
M556BXXS5DZH1
Security update
|
5 | MID | 16 |
2026-08-18 | Download |
|
M556BXXS5DZH1
Security update
|
5 | COO | 16 |
2026-08-14 | Download |
|
M556BXXS5DZH1
Security update
|
5 | PEO | 16 |
2026-08-14 | Download |
|
M556BXXS5DZH1
Security update
|
5 | MXD | 16 |
2026-08-14 | Download |
|
M556BXXS5DZH1
Security update
|
5 | ZTO | 16 |
2026-08-14 | Download |
|
M556BXXS5DZH1
Security update
|
5 | TPA | 16 |
2026-08-14 | Download |
|
M556BXXS5DZH1
Security update
|
5 | CHO | 16 |
2026-08-14 | Download |
|
M556BXXS5DZH1
Security update
|
5 | SLK | 16 |
2026-08-13 | Download |
|
M556BXXS5DZH1
Security update
|
5 | INS | 16 |
2026-08-13 | Download |
|
M556BXXS5DZH1
Security update
|
5 | NPB | 16 |
2026-08-13 | Download |
|
M556BXXS5DZH1
Security update
|
5 | BNG | 16 |
2026-08-13 | Download |
|
M556BXXS5DZF2
Security update
|
5 | COO | 16 |
2026-06-12 | Download |
|
M556BXXS5DZF2
Security update
|
5 | ZTO | 16 |
2026-06-12 | Download |
|
M556BXXS5DZF2
Security update
|
5 | TPA | 16 |
2026-06-12 | Download |
|
M556BXXS5DZF2
Security update
|
5 | MXD | 16 |
2026-06-12 | Download |
|
M556BXXS5DZF2
Security update
|
5 | PEO | 16 |
2026-06-12 | Download |
|
M556BXXS5DZF2
Security update
|
5 | CHO | 16 |
2026-06-12 | Download |
|
M556BXXS5DZF2
Security update
|
5 | MID | 16 |
2026-06-11 | Download |
|
M556BXXS5DZF2
Security update
|
5 | EGY | 16 |
2026-06-11 | Download |
|
M556BXXS5DZF2
Security update
|
5 | ILP | 16 |
2026-06-11 | Download |
|
M556BXXS5DZF2
Security update
|
5 | ILO | 16 |
2026-06-11 | Download |
|
M556BXXS5DZF2
Security update
|
5 | XXV | 16 |
2026-06-10 | Download |
|
M556BXXS5DZF2
Security update
|
5 | SLK | 16 |
2026-06-10 | Download |
|
M556BXXS5DZF2
Security update
|
5 | BNG | 16 |
2026-06-10 | Download |
|
M556BXXS5DZF2
Security update
|
5 | NPB | 16 |
2026-06-10 | Download |
|
M556BXXS5DZF2
Security update
|
5 | INS | 16 |
2026-06-10 | Download |
|
M556BXXS5CZB4
Security update
|
5 | TPA | 16 |
2026-03-10 | Download |
|
M556BXXS5CZB4
Security update
|
5 | ZTO | 16 |
2026-03-10 | Download |
|
M556BXXS5CZB4
Security update
|
5 | COO | 16 |
2026-03-10 | Download |
|
M556BXXS5CZB4
Security update
|
5 | MXD | 16 |
2026-03-10 | Download |
|
M556BXXS5CZB4
Security update
|
5 | CHO | 16 |
2026-03-10 | Download |
|
M556BXXS5CZB4
Security update
|
5 | PEO | 16 |
2026-03-10 | Download |
|
M556BXXS5CZB4
Security update
|
5 | XXV | 16 |
2026-03-09 | Download |
|
M556BXXS5CZB4
Security update
|
5 | MID | 16 |
2026-03-09 | Download |
|
M556BXXS5CZB4
Security update
|
5 | ILO | 16 |
2026-03-09 | Download |
|
M556BXXS5CZB4
Security update
|
5 | ILP | 16 |
2026-03-09 | Download |
|
M556BXXS5CZB4
Security update
|
5 | EGY | 16 |
2026-03-09 | Download |
|
M556BXXS5CZB4
Security update
|
5 | SLK | 16 |
2026-03-04 | Download |
|
M556BXXS5CZB4
Security update
|
5 | BNG | 16 |
2026-03-04 | Download |
|
M556BXXS5CZB4
Security update
|
5 | NPB | 16 |
2026-03-04 | Download |
|
M556BXXS5CZB4
Security update
|
5 | INS | 16 |
2026-03-04 | Download |
|
M556BXXS4CYL1
Security update
|
4 | COO | 16 |
2026-01-07 | Download |
|
M556BXXS4CYL1
Security update
|
4 | MXD | 16 |
2026-01-07 | Download |
|
M556BXXS4CYL1
Security update
|
4 | CHO | 16 |
2026-01-07 | Download |
|
M556BXXS4CYL1
Security update
|
4 | TPA | 16 |
2026-01-07 | Download |
|
M556BXXS4CYL1
Security update
|
4 | ZTO | 16 |
2026-01-07 | Download |
Latest SM-M556B Firmware by Region
The newest build for each region (CSC) code. Not sure which region your phone uses? See the CSC code guide.
| Region | Latest build | Bit | Android | Date |
|---|---|---|---|---|
| BNG | M556BXXS5DZH1 | 5 | 16 | 2026-08-13 |
| CHO | M556BXXS5DZH1 | 5 | 16 | 2026-08-14 |
| COO | M556BXXS5DZH1 | 5 | 16 | 2026-08-14 |
| EGY | M556BXXS5DZH1 | 5 | 16 | 2026-08-18 |
| ILO | M556BXXS5DZH1 | 5 | 16 | 2026-08-18 |
| ILP | M556BXXS5DZH1 | 5 | 16 | 2026-08-18 |
| INS | M556BXXS5DZH1 | 5 | 16 | 2026-08-13 |
| MID | M556BXXS5DZH1 | 5 | 16 | 2026-08-18 |
| MXD | M556BXXS5DZH1 | 5 | 16 | 2026-08-14 |
| NPB | M556BXXS5DZH1 | 5 | 16 | 2026-08-13 |
| PEO | M556BXXS5DZH1 | 5 | 16 | 2026-08-14 |
| SLK | M556BXXS5DZH1 | 5 | 16 | 2026-08-13 |
| TPA | M556BXXS5DZH1 | 5 | 16 | 2026-08-14 |
| XXV | M556BXXS5DZH1 | 5 | 16 | 2026-08-18 |
| ZTO | M556BXXS5DZH1 | 5 | 16 | 2026-08-14 |
How to Flash SM-M556B Firmware
Put the Samsung Galaxy M55 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 5 or higher if your phone is already on the latest firmware. Use HOME_CSC to keep your data, CSC for a full wipe.