Hi @Lars1.
I have now tested what you suggested. What I note is that the reset button doesn't make it come out of Fejltilstand!. I need to load the factory default FW for it to be okay again.
Then I tried with just a direct ethernet cable from laptop to controller. But it failed to load the config anyway, same as before. Then I tried with the USB cable but exactly the same behavior.
I then tried with a much smaller config, I did save it separate just after adding some inputs/outputs in the process of redoing all configuration from the old configuration, and that transfer works fine, but with the bigger one it still fail when sending project.
At that moment I also noticed that it was enough to send the "small" configuration to controller to make it come out of fejltilstand, without any reset or factory default fw.
So to me it looks like there is something wrong with my configuration, can that be detected in the middle of the file transfer? And aborted the transfer?
Does anyone have a "big" working configuration file to version 3 controller that is known working and could be shared with me just for testing?