To make it plain and simple:
Do you own a Switch on FW 3.0.0?
If you do, can you please insert the cartridge which you say you own and confirm that it prompts an update?
Thanks.
I got a Switch on 3.0.0, Mario will arrive later. If no one posts until then, I will gladly confirm it. (I don't expect it to be something else, because then someone would have posted something here (maybe))