So I just opened up our new Ultimaker 3 and already having issues with setup.
Walking through the steps on the display, it acknowledges that Print hear slot 1 has PrintCore AA (as it came from factory), then says that "Print head slot 2 has PrintCore AA 0.4, Replace with BB 0.4". It clearly has BB 0.4 in slot 2.
Then I got an error message that it told me to look up, so I did and it just said to restart the machine. Did that. Still won't recognize that slot 2 has BB 0.4 loaded in it. So I removed and replaced BB 0.4 and the fan started going crazy and gave me another error code to look up. So I did, and restarted the machine again.
I've rebooted the machine 3 or 4 times, and I can't get it to correctly recognize slot 2.