Procedure before selling?

What do I need to do before selling?
Is there any factory reset?
And what do I need to unregister so that the new owner doesn’t get any problems?


You would just need to complete a factory reset within settings following the current QC manual

Thanks, and I don’t need to unregister me as a owner after that?

There is nothing tying the previous owner to the QC post factory reset. You should be good regarding selling the QC.