no idea if it is compatible with Sierra. I don’t own a max personally so it is very difficult to check it for every new osx version.
Which error message do you get when starting the app?
Also, when updating firmware, can i go straight to the newest option or do i haver to install all chronologically?
Yes, just update to the newest version.
No luck sadly, i think it must not be compatible with Sierra as the files don’t read as they normally do. Will have to borrow another computer and try again