Simplicity Studio Version 6.1.0 (Jan 22, 2026) Release Notes#

Welcome to the General Availability (GA) release of Simplicity Studio 6, the next-generation development environment for Silicon Labs Series 2 and Series 3 platforms.

This release introduces a modernized foundation focused on a modular architecture, improved SDK management, and increased extensibility for developer workflows.

Release Summary#

Key Features Added in Studio 6.1.0#

  • Added support for Simplicity SDK 2025.12.

  • Added update indications to Studio. A red bubble appears on the Package icon when updates are available from Simplicity Installer - Package Manager.

  • Added an About menu under Settings, providing Studio version information and a link to Release Notes.

  • Studio now generates toolchain.cmake for VS Code and CMake projects.

    • Tool paths are no longer hardcoded.

    • Tool paths are dynamically resolved from the SLT location in the system PATH, improving portability across environments.

    • Verified with Simplicity Studio VS Code Extension 2.0.0.

Bug Fixes#

Fixed in Studio 6.1.0#

  • Fixed an issue in the New Project Wizard related to project naming.

  • Fixed an issue where moving a CMake project could cause build failures due to stale CMake cache paths.

  • Improved handling of toolchain.cmake paths when sharing projects across different development machines.

  • Fixed an issue where the Simplicity Studio back end could shut down after running for long periods.

Chip Enablement#

  • This release supports Series 2 and Series 3 devices.

Removed or Deprecated Features#

  • None.

Known Issues and Limitations#

Issue / Limitation

Description

Workaround

Project Generator

An HTTP 404 error may appear in the Project Configuration step of the New Project Wizard when generating a project.

Close the New Project Wizard window and retry the operation.

Device Selector Dialog

Limited filtering functionality by protocol.

None

Matter Provisioning Tool

Not available in the current release.

None

IAR Project Generator

Not available from the New Project Wizard view.

See the Select a Target IDE section.

Multiple Instance Support (*)

Running multiple instances of the same version of Studio simultaneously is not supported.

None

Bug Report (*)

No Bug Report option available.

Capture log files as described in the Reporting an Issue section.

Adapter Firmware Update

The Device Overview UI may not indicate that Adapter Firmware version 2.0.0 is available. (Check if this is fixed)

Open Device Manager to manually check for updates, or close and reopen the Devices tab.

Windows BSOD with Older Adapter Firmware

Using Adapter Firmware versions earlier than v2.0.0 may result in a Windows BSOD.

Update to Adapter Firmware v2.0.0 or later (uses Microsoft WinUSB driver).

Old SDK Shown After Upgrade

When upgrading a project (for example, from Simplicity SDK 2025.6.2 to Simplicity SDK 2025.12.0), Studio 6 may continue to display the previous SDK version in the Project view. This does not indicate a failed upgrade. The project is expected to upgrade successfully and build correctly. The correct SDK version is reflected in the Simplicity Studio VS Code extension project tree.

None

Note (*) This is a change from Studio v5 behavior. While not an issue or limitation, it may affect existing workflows.

SDKs#

Matter#

  • On Windows, Matter projects using Matter SDK 2.8.0 (released with SiSDK 2025.12.0) may fail during compilation due to a known GCC 12.x issue related to long command-line lengths.

Workaround: See the relevant Knowledge Article.

SixG301#

  • SixG301 devices are only supported with CMake/GCC (no IAR support). Refer to the Known Issues and Limitations section for additional details.

Workaround: Refer to the Known Issues and Limitations section for additional details.

Additional Bug Fixes#

Fixed in Studio 6.1.0#

  • No additional fixes documented.

UID

Issue Description

1568381

Fixed an issue where migrated SSv5 projects failed to open .slcp files in Studio 6.

1568546

Fixed .slcp files not opening after migrating Wi-Fi projects from Simplicity Studio 5.

1529513

Fixed the IAR CMake generator to include IAR-specific .asm assembly files.

1546728

Fixed CMake build failures caused by stale cache paths after moving projects.

1534661

Fixed an issue where the Studio backend could shut down after being left running overnight.

1525887

Fixed an issue where renaming a project could corrupt the generated CMakeLists file.

1530456

Fixed intermittent NullPointerException errors when working with .slcp files and components.

1531131

Fixed the IAR CMake generator to avoid setting the --cms flag on unsupported targets.

1563538

Fixed an issue where Wi-Fi projects imported from Studio 5 could not be debugged.

1542836

Fixed issues updating toolchain.cmake paths when sharing projects across machines.

1564081

Fixed CMake generation failures caused by absolute source paths.

1518051

Fixed missing debugger adapter firmware update notifications in Studio.

1563254

Fixed Bluetooth LE and Z-Wave tiles not responding due to SDK metadata mismatches.

1532106

Fixed an issue where project generation could complete without creating the project.