Samsung Galaxy M56 5G (SM-M566B) Firmware Overview
What is the latest SM-M566B firmware?
M566BXXS7CZI1, released September 5, 2026 with Android 16. It is a security update on bootloader binary 7. The archive holds 9 official builds across 1 region (CSC).
Is the Samsung Galaxy M56 5G still getting updates?
Yes. The newest build is from September 2026.
Which Android versions did it get?
The SM-M566B builds in the archive run Android 15 to 16. The earliest build we have for each version:
- Android 16: M566BXXU3BYI6 (Sep 2025), 6 builds in total
- Android 15: M566BXXU1AYCA (Mar 2025), 3 builds in total
Can I downgrade the SM-M566B 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 7:
- Binary 7 — since Sep 2026
- Binary 6 — since Aug 2026
- Binary 5 — since Feb 2026
- Binary 4 — since Nov 2025
- Binary 3 — since Aug 2025
- Binary 2 — since May 2025
- Binary 1 — since Mar 2025
A phone already on binary 7 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 7 build. How to read a build number.
All SM-M566B firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
M566BXXS7CZI1
Security update
|
7 | INS | 16 |
2026-09-05 | Download |
|
M566BXXS6CZH4
Security update
|
6 | INS | 16 |
2026-08-26 | Download |
|
M566BXXU5CZE2
Feature update
|
5 | INS | 16 |
2026-05-12 | Download |
|
M566BXXU5BZB4
Feature update
|
5 | INS | 16 |
2026-03-03 | Download |
|
M566BXXS4BYK2
Security update
|
4 | INS | 16 |
2025-11-17 | Download |
|
M566BXXU3BYI6
Feature update
|
3 | INS | 16 |
2025-09-22 | Download |
|
M566BXXS3AYH1
Security update
|
3 | INS | 15 |
2025-08-05 | Download |
|
M566BXXU2AYE4
Feature update
|
2 | INS | 15 |
2025-05-12 | Download |
|
M566BXXU1AYCA
Feature update
|
1 | INS | 15 |
2025-03-27 | Download |
How to Flash SM-M566B Firmware
Put the Samsung Galaxy M56 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 7 or higher if your phone is already on the latest firmware. Use HOME_CSC to keep your data, CSC for a full wipe.