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do this,

disconnect the power and plug in the nano with a usb cable. the raduino should still light up. now try programing it.

?I already did this. Doesn't change anything.

Do you think it is possible to buy just the pcb with the nano on it? Don't need a 2nd display. If yes, what would be the difference in the price?

I juszt received my new Arduino Nano board from China and tried to upload the sketch and it worked without any problems. So it is for sure now, that the Nano on the Raduino died during the calibration porocess.

I have to unsolder the old and solder the new one now. Will do it on the weekend and then hopefully be able to get the BITX40 ready.

It's alive again. Just unsoldered the old Nano (what a pain) and soldered the new one in place. Now it works again, and I can finish this nice rig.

I have a question, just to be sure not to burn it again.

What is the recommended ground point where the red wire from the Raduino should be shortened to switch to calibration mode. As I killed the Nano during calibration, I just want to be safe not to make the same mistake again.

Could be, I just shortened something, as I did not solder a button but only held the blank wire to ground, while turning the VFO. So could also be a handling mistake and not that I used a wrong ground point, but who knows?