Today, after 1 w waiting, I received the parcel (from China via DHL).
But.. instead of new, correct motor control module or new processor (as I hoped we agreed after many messages), I found the potentiometer in the box
(not that I wasn't expected something un-expected after what was going on previously).
I will have to give negative feedback to this seller..
They really, really don't know what they are selling (and neither manufacturer know what they are doing.. or they think I am stupid. Which is probably true because I was too patient with them).
Anyway.. not a big deal really (machine works), but this is not the way how to treat customers.