I wrote an easy to follow tutorial on how to setup your own Thread Border Router using an nRF52840 USB Dongle and a Raspberry Pi 4 to connect the Thread Sensor Tag to it using the commission feature of Thread.

You can find the Instructables here: https://www.instructables.com/How-to-Setup-a-OpenThread-Border-Router-Using-a-NR/

or if you prefer a Hackaday.io Page I also created a page for that here: https://hackaday.io/page/22272-how-to-setup-a-open-thread-border-router-with-raspberry-pi-and-connect-the-thread-sensor-tag

I would be happy about any feedback!