There were some discussions on the Acekard forum about what, if anything, changed withe the latest US 3DS System Update (2.1.0-4U). One thing I have noticed is that StreetPass is working much better. There are three of us at work that carry our 3DS with us. Before the update it could take hours for StreetPass to register. Some days it never registered. After the update StreetPass usually registers withinn a minute after we get within 30 feet of each other.