In short, a friend lent me a Ryu amiibo, to level it up in Turbo mode. Level 50, sent it back to play in regular Smash (we know nothing notable would happen in vanilla Smash) and the amiibo reset and won't save data. Also, it sets the name as Ryu.amb. We think .amb is a file extension for amiibo. So has this happened to anyone else?