Toolhead configuration cannot be deserialized

During the setup i get this error message when configuring the toolboard. Also the fans connected to the toolboard are doing the opposite, they are supposed to (running with 100% when they should be off and the other way around).

How do i fix this?

I have a v-core 4 in the base configuration with BTT EBB 42 CAN V1.2 toolhead.
I recived the printer in November and finished the build in the beginning of December and did my initial setup. With it beeing so long ago i dont remeber what i did or didnt do at that time. But i remember, that i didnt have that issue back then.
In the meantime I have already did all updates available in the Update Manager.
Due to limited time and other issues i already i fixed, this printer didnt print so far.

I already tried doing a Factory reset and it didnt fix the issue.

Thanks for your help in advance.