The new LE-only dongle from Laird Connectivity and the Nordic nRF54L15 device does not come with PTS firmware pre-installed.

In order to upgrade the firmware of your dongle, you will need to download the PTS Firmware Upgrade Software which can be downloaded here.

• After it has been installed, run the PTS Firmware Upgrade Software and follow the prompts.
• IMPORTANT - Make sure to select the correct dongle to upgrade. 

• Nordic nRF54L15 device requires the nRF Connect tool that can be downloaded from the Nordic Semiconductor website.