Direct Test Mode v2.4.1 GUI does not work with third party boards

Using nRF Connect for Desktop on Ubuntu 24.04 LTS I am trying to use the Direct Test Mode v2.4.1 software with our own custom board.

On https://docs.nordicsemi.com/bundle/nrf-connect-direct-test-mode/page/index.html you wrote:

> The application also supports third-party devices that are programmed with the DTM standard protocol and expose access to it through a serial port.

But it is not possible. Trying to select the FTDI based UART and running clicking "Start test" I see the following error:

At the same time I am connected to the board via RTT to view logs and don't see any communication.

On the contrast when I use cutecom to send commands as hex codes directly, everything works as expected:

And I see the expected communication activity on the RTT logs:

Help would be much appreciated. It would be much more convenient to use your GUI based Direct Test Mode tool instead of sending and decoding the DTM commands as hex manually.

There are no problems by the way using a nrf52840DK. It only does not work with the custom board, connected via UART, although you explicitly write:

The application also supports third-party devices that are programmed with the DTM standard protocol and expose access to it through a serial port.

Thanks

Alex

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