Setting up your XM122#

For detailed instructions, visit our developer page.

Finding the serial port#

On Windows, use device manager to find the port which will be listed as USB Serial Port. It’s most likely COMx where x is 3 or higher. On Linux, it’s likely /dev/ttyUSBx where x is 0 or some other integer.

PySerial has a simple tool for listing all ports available:

python -m

Windows COM port drivers#

If no COM port is recognized when plugging in a module, you might need to install a driver:


Download the module software from our developer page. In the archive, acconeer_xm122_module_software_v*.zip, you’ll find, which is the package to flash.

We recommend flashing using the Python library nrfutil. Install it with:

python -m pip install nrfutil

Enter the XM122 bootloader by doing the following:

  • Hold down the DFU button

  • Push the RESET button

  • Release the RESET button

  • Let go of the DFU button

Now you should be able to flash:

nrfutil dfu serial -pkg -p /dev/ttyUSB0

After flashing, press the RESET button to reboot into the flashed software.