I am also facing same issue, HomePod mini stuck on downloading. There is no way to stop this it’s automatically start whenever you connect. It’s consuming huge internet data while playing any song. It’s consuming 1gb data per song that’s pathetic, unbelievable.
i tried changing router and by switching on sound check but no resolution. I really need someone’s help here because it’s total waste of money and I am not able to use it. Thanks