nRF Connect SDK v2.1.2 Release Notes

nRF Connect SDK delivers reference software and supporting libraries for developing low-power wireless applications with Nordic Semiconductor products in the nRF52, nRF53, nRF70, and nRF91 Series. The SDK includes open source projects (TF-M, MCUboot, OpenThread, Matter, and the Zephyr RTOS), which are continuously integrated and redistributed with the SDK.

Release notes might refer to “experimental” support for features, which indicates that the feature is incomplete in functionality or verification, and can be expected to change in future releases. To learn more, see Software maturity levels.


This minor release adds the following changes on top of the nRF Connect SDK v2.1.0 and nRF Connect SDK v2.1.1:

  • Changes to the Bluetooth® mesh solution to improve performance and stability using extended advertiser.

  • Changes to Emergency Data Storage to improve performance and stability.

See Changelog for the complete list of changes.

Release tag

The release tag for the nRF Connect SDK manifest repository ( is v2.1.2. Check the west.yml file for the corresponding tags in the project repositories.

To use this release, check out the tag in the manifest repository and run west update. See Get the nRF Connect SDK code and Examples of commands for more information.

For information on the included repositories and revisions, see Repositories and revisions for v2.1.2.

IDE and tool support

nRF Connect for Visual Studio Code extension is the only officially supported IDE for nRF Connect SDK v2.1.2. SEGGER Embedded Studio Nordic Edition is no longer tested or recommended for new projects.

Installing automatically, used to install the nRF Connect SDK automatically from nRF Connect for Desktop, is available for Windows, Linux, and macOS.

Supported modem firmware

See Modem firmware compatibility matrix for an overview of which modem firmware versions have been tested with this version of the nRF Connect SDK.

Use the latest version of the nRF Programmer app of nRF Connect for Desktop to update the modem firmware. See Updating the modem firmware for instructions.

Known issues

Known issues are only tracked for the latest official release. See known issues for nRF Connect SDK v2.1.2 for the list of issues valid for the latest release.


The following sections provide detailed lists of changes by component.


This section provides detailed lists of changes by protocol.

Bluetooth mesh

  • Fixed bugs that appeared when using extended advertiser.


This section provides detailed lists of changes by sample, including protocol-related samples. For lists of protocol-specific changes, see Protocols.

Bluetooth samples


This section provides detailed lists of changes by library.

Binary libraries

  • LwM2M carrier library:

    • Updated the glue layer to facilitate switching from NB-IoT to LTE-M during in-band FOTA.

Other libraries

  • Emergency data storage library:

    • Removed the internal thread for storing the emergency data. The emergency data is now stored by the emds_store() function.

    • Updated the library implementation to bypass the flash driver when storing the emergency data. This allows calling the emds_store() function from an interrupt context.


The Zephyr fork in nRF Connect SDK (sdk-zephyr) contains all commits from the upstream Zephyr repository up to and including 71ef669ea4a73495b255f27024bcd5d542bf038c. This is the same commit ID as the one used for nRF Connect SDK v2.1.0 and v2.1.1. It also includes some nRF Connect SDK specific additions and commits cherry-picked from the upstream Zephyr repository.

For a complete list of nRF Connect SDK specific commits and cherry-picked commits since v2.1.0, run the following command:

git log --oneline manifest-rev ^v3.1.99-ncs1