Configure Parameters Dynamically

I need some advice: I want to change the controller parameters dynamically. I've added the corresponding register in the XML file. As soon as I add this parameter, my drive stops connecting. (It doesn't switch to the required mode) Does anyone know how to solve this?

I would expect a 2xxx register to require configuration  via SDOs so check your drive's docs.
Its outside the CIA402 range but maybe that does not apply.

What type of EC device is that?
What parameter are you trying to change?

Terminal:
sudo dmesg -wH
start you machine

Watch for error messages.

Enable more debugging:

Terminal:
ethercat debug 1
sudo dmesg -wH

start your machine.

Post debug or dmesg output