Hello,
I received a new BB print core for our UM3 extended. While I have been waiting for this print core I have had the extra AA print core installed in the second print head slot. Now when I change heads the machine still think it's an AA core installed, complaining about incompability with materials etc.
The print core is brand new and the connectors look clean. I updated to the latest firmware while I was waiting for my new BB print core.