Silicon Labs Matter Version 2.9.0-1.6 (June 25, 2026) - Release Notes#

Simplicity SDK Version 2026.6.0

The Silicon Labs Matter v2.9.0-1.6 release provides the functionality to build Matter applications in the Simplicity Studio environment. This release is intended for developers who want to run Matter Demo over Thread (15.4) or Wi-Fi, and also manually build examples through Simplicity Studio v6 / Visual Studio Code or SLC-CLI.

This release is aligned with CSA Matter 1.6 for Thread (MG24, MG26, and MG30) and Wi‑Fi (SiWG917 and MG24 + SiWN917).

Note: At the time of this release, the Connectivity Standards Alliance (CSA) certification is not finalized for Matter 1.6 branch. As a result, this release may not pass all Matter 1.6 certification test cases. If needed, you can either wait for the Matter Extension 2.9.1 patch with the required fixes, or cherry-pick the fixes directly into your branch for earlier adoption. Contact Silicon Labs support if you need any assistance.

Release Summary#

Key Features | API Changes | Bug Fixes | Chip Enablement

Key Features#

• Quality-tested Matter 1.6 solution for Thread and Wi-Fi.

• Matter + AWS dual-stack support for 917 NCP boards.

API Changes#

None

Bug Fixes#

See Bug Fixes.

Chip Enablement#

• Added support for late-arriving refresh boards: BRD4343C for Matter Wi-Fi SoC applications and BRD4357C for selected Matter Wi-Fi NCP applications. Silicon Labs has completed enablement and SQA validation for the supported application scope; customers should refer to the supported boards and application sections for exact coverage.

Key Features#

New Features | Enhancements | Removed Features | Deprecated Features

New Features#

• Quality-tested Matter 1.6 solution for Thread MG24 / MG26 / MG30, Wi-Fi SiWG917 SoC and SiWN917 NCP mode.

• Matter + AWS dual-stack support for 917 NCP boards.

• Added LTO build support for SiWG917 sleepy and non-sleepy Matter Wi-Fi applications

• Updated the GCC toolchain version to 14.2 release.

Enhancements#

• Added new reworked Energy Management Clusters.

• Lighting, Lock, Light Switch, On-Off plug, Thermostat, Rangehood, Platform Template, and Air Quality Apps to support a new appReworked architecture designed to make upgrades easier.

• Dual IP Stack support for MQTT Sidechannel

Removed Features#

• Matter Wi-Fi support for MG24 + WF200 has been removed.

Deprecated Features#

None.

API Changes#

New APIs | Modified APIs | Removed APIs | Deprecated APIs

New APIs#

None.

Modified APIs#

None.

Removed APIs#

None.

Deprecated APIs#

None.

Bug Fixes#

Chip Enablement#

Matter over Thread is supported on the following boards#

• MG24 boards:

  • BRD4186C / SLWSTK6006A / Wireless Starter Kit / 2.4GHz@10dBm - xG24-RB4186C

  • BRD4187C / SLWSTK6006A / Wireless Starter Kit / 2.4GHz@20dBm - xG24-RB4187C

  • BRD2601B / MG24 Developer Kit - xG24-DK2601B

  • BRD2703A / MG24 Explorer Kit - xG24-EK2703A

• MGM24 boards:

  • BRD4316A / SLWSTK6006A / Wireless Start Kit / 2.4GHz@10dBm - xGM240-RB4316A

  • BRD4317A / SLWSTK6006A / Wireless Starter Kit/ 2.4GHz@20dBm - xGM240-RB4317A

  • BRD4318A / SLWSTK6006A / Wireless Starter Kit/ 2.4GHz@20dBm - xGM240-RB4318A

  • BRD4319A (Rev A00 only) / SLWSTK6006A / Wireless Starter Kit/ 2.4GHz@20dBm

  • BRD2704A / Sparkfun Thing Plus MGM240P

  • BRD4337A / SLWSTK6006A / Wireless Starter Kit / 2.4GHz@20dBm - xGM240-RB4337A

• MG26 boards

  • BRD4116A

  • BRD4117A

  • BRD4118A

  • BRD4120A

  • BRD4121A

  • BRD2608A

  • BRD2709A

• MGM26 boards

  • BRD4350A

  • BRD4351A

• MG30 Boards

  • BRD4407A

  • BRD4408A

  • BRD2719A

Matter over Wi-Fi is supported on the following boards#

• SoC mode:

  • BRD4338A / SiWG917 Wi-Fi 6 and Bluetooth LE 8 MB Flash SoC Pro Kit - SiWx917-PK6031A

  • BRD2605A / SiWG917 Wi-Fi 6 and Bluetooth LE Dev Kit - SiWx917-DK2605A

  • BRD4342A / SiWG917 Wi-Fi 6 and Bluetooth LE 8 MB Flash + 8 MB ext PSRAM Radio Board with an internal RF switch - SiWx91x-RB4342A

  • BRD4343A / SiWG917Y Module Wi-Fi 6 and Bluetooth LE 8MB Flash RF-Pin Radio Board - SiW917Y-RB4343A

  • Early access for BRD4343C / SiWG917Y-X Module Wi-Fi 6 and Bluetooth LE 8MB Flash Antenna Radio Board

  • Early access for new module board BRD2708A / SiW917Y-EK2708A

• NCP mode:

  • Host Processor:

    • BRD4186C / EFR32xG24 Wireless 2.4 GHz +10 dBm Radio Board (EFR32 radio board) - xG24-RB4186C

    • BRD4187C / EFR32xG24 Wireless 2.4 GHz +20 dBm Radio Board - xG24-RB4187C

  • Silicon Labs Wi-Fi Processor:

    • SiWx917-EB4346A - SiWx917 Wi-Fi 6 and Bluetooth LE Co-processor EXP Expansion Kit

    • SiW917Y-RB4357A - SiWN917Y Module Wi-Fi 6 and Bluetooth LE 4MB Flash RF-Pin Co-Processor Radio Board

    • Early access for SiW917Y-RB4357C Module Wi-Fi 6 and Bluetooth LE 4MB Flash RF-Pin Co-Processor Radio Board

Note: Firmware for SiWN917 NCP, and SiWG917 SoC can be found in the Matter Software Artifacts page in the documentation or Assets section of this page. Connectivity firmware update is mandatory for new release binaries.

Application Example Changes#

New Examples | Modified Examples | Removed Examples | Deprecated Examples

For the list of supported application examples, see Existing Examples. For the details on Matter ecosystems support, see Ecosystems.

New Examples#

• EVSE

• Wake on Matter

Modified Examples#

All Matter examples have been renamed to align with the naming convention used across the Simplicity SDK. The new naming format is: Matter <Thread/WiFi> - <SoC/NCP> <Example Name> <OS>.

The following examples have been refactored to support project upgrades from v2.9.0 onward by implementing CRTP architecture. For more information on refactoring effort, see Application Customization Models

• Lighting

• Zigbee Matter Light

• On-Off Plug

• Thermostat

• Lock

• Light Switch

• Rangehood

• Platform Template

• Air Quality Sensor

Removed Examples#

None.

Deprecated Examples#

None.

Known Issues and Limitations#

Impact of Release Changes#

Impact Statements | Migration Guide

Impact Statements#

None.

Migration Guide#

sl_main migration: See sl_system to sl_main migration guide for detailed instructions.

Using This Release#

What's in the Release? | Compatible Software | Installation and Use | Help and Feedback

What's in the Release?#

• Silicon Labs Matter Extension for use with Simplicity Studio and SLC-CLI.

• Silicon Labs Matter sample applications.

Compatible Software#

Installation and Use#

To get started, download Simplicity Studio from the following link: https://www.silabs.com/developers/simplicity-studio, and install Simplicity SDK v2026.6.0 along with Silicon Labs Matter v2.9.0. For SiWx917, install WiSeConnect v4.1.0 as well.

Quick-start guides are provided for running pre-compiled demos and for building examples manually.

The Developer's Guide provides information on various technical topics.

For details on Studio project upgrades, see Project Upgrades.

In order to run Matter over Thread, a developer must have a Silicon Labs EFR-based device and either:

• another EFR-based device and a Raspberry Pi with a 32 GB SD Card,

• or an ecosystem device with OpenThread Border Router capabilities, such as Amazon Echo, Apple HomePod, Samsung SmartThings Hub or Google Nest Hub Wi-Fi.

In order to run Matter over Wi-Fi, a developer must have the following hardware:

• Silicon Labs Wireless starter/development kit, which is mentioned below.

• Raspberry Pi with a 32 GB SD Card or an ecosystem with Matter support

To run your first demo, see our Getting Started Guides.

To kick start your development, see our Developer's Guide.

For information about Secure Vault Integration, see Secure Vault.

To review Security and Software Advisory notifications and manage your notification preferences:

1. Go to https://community.silabs.com/.

2. Log in with your account credentials.

3. Click your profile icon in the upper-right corner of the page.

4. Select Notifications from the dropdown menu.

5. In the Notifications section, go to the My Product Notifications tab to review historical Security and Software Advisory notifications.

6. To manage your preferences, use the Manage Notifications tab to customize which product updates and advisories you receive.

To learn more about the software in this release, see our online documentation.

Help and Feedback#

• Contact Silicon Labs Support.

• To use our Ask AI tool to get answers, see the search field at the top of this page.

Note: Ask AI is experimental.

• Get help from our developer community.

SDK Release and Maintenance Policy#

See our SDK Release and Maintenance Policy.

Additional Information#

Existing Examples#

Matter over Thread is supported in Simplicity Studio for the following applications#

• Light

• Light Switch

• Lock

• Window Covering

• Thermostat

• OnOff Plug

• Sensor

• Air Quality Sensor

• Refrigerator

• Zigbee/Matter CMP Lighting

• Closure

• Fan Control

• Platform Template

Matter over Wi-Fi is supported in Simplicity Studio for the following applications#

SoC and Dev Kit supported applications:

• Light

• Lock

• Light Switch

• Window Covering

• OnOff Plug

• Thermostat

• Air Quality Sensor

• Sensor

• Fan Control

• Refrigerator

• Oven

• Rangehood

• Platform Template

• Closure

NCP supported applications:

• Lock

• Thermostat

• Window Covering

Matter over Wi-Fi ICD is supported for the following applications#

• Lock (ICD is enabled by default)

  • With EFR32xG24 with SiWN917 in NCP mode

• Window Covering (ICD is enabled by default)

  • With EFR32xG24 with SiWN917 in NCP mode

• Thermostat

  • With EFR32xG24 with SiWN917 in NCP mode

• Light Switch

  • With SiWG917 SoC

Reference guide to enable the sleepy functionality for Wi-Fi: Wi-Fi ICD.

Ecosystems#

This release has been tested and proven to work for commissioning and control with the following Ecosystems on the hardware and software versions listed below:

Google#

Apple#

Amazon#

Samsung#

Project Upgrades#

Matter 1.6 introduces significant changes. For projects using Matter Extension versions earlier than 2.9.0, do not use Simplicity Studio's automatic project upgrade flow. Instead, follow these steps to upgrade an existing project to Matter Extension 2.9.0 or 2.9.0 to a later version.

• Create a new 2.9.0 project for the same application type (Lighting, Lock, etc.).

• For each of the files in the project's src/ and include/ directories that were modified from their original version, apply the corresponding changes to the new project.

• Replicate the non-default component configurations used in the original project.

• Using the ZAP tool, replicate the additional cluster configurations applied in the original project.

Matter Software Artifacts#

Matter Software Artifacts: https://docs.silabs.com/matter/2.9.0/matter-prerequisites/matter-artifacts.