What do you mean by dongle ? The speed box 2 is a easy fit on the crossfuse, only two screws to remove 5 min job. Can be turned on and off by walk button, and does not affect Speedo mph or kph. When you say dongal are you talking about the magnet and sensor being moved ?
Just done a quick search for that badass dongal. Its way to much @ £140 I would just move the magnet before I would pay that, Does the same job. See you tube clip. On my bike with the bosch active plus. Its easy to fit speed box 2, and cost less. Don’t even have to remove peddle crank as you can get access, by just removing two screws from cover. I don’t think you can do this with CX motor. Its peddle crack off to get access I think.
problem is no one has ever proved the moving the magnet trick has ever worked it came from the gen 1 bikes when it was a work round but ever since the gen 2 motors it has not worked and yes i did try it and got a 503 error.
the bad ass dongle is a small electro magnet that sends pulses to the sensor so it thinks it is doing half the speed and putting the magnet on the crank arm thus wont do anything other than change the wheel size and no dealer can change this to increase the speed limit than stock anyway.
I've got a 2019 haibike xduro 6.0 with performance line cx and the speedbox does not work on it. I also have a 2019 haibike sduro trekking with a performance line cx and it does work. The trekking appears to have a different engine casing so I'm guessing the xduro has the latest Bosch version. And clearly the software has been altered to prevent chipping. I tried 3 times swooping the dongle from bike to bike with the same result each time.