Thanks for the quick replies!
1) not all the keys are working. E1, C2, Ab2, E3, C3, Ab3, E4, C5 are not working. (I see a pattern…)
2) arp isn’t working at all. Also not with midi clock…(while midi note in is working well)
3) still have the old cpu. I’m happy that I removed it carefully without cutting the legs… Can I plug it in the socket? Or do I have to remove the socket as well?