You can now update the game to Ver. 6.1.1.
Update Details
The latest software version is needed to enjoy the following features:
◯ General
・ Support for the upcoming Dark Samus and Richter amiibo figures (sold separately) has been implemented.
Compatibility Issues
・ The latest software version is required to enter Online mode.
・ Local wireless play is not compatible with Ver. 6.1.0 and earlier. All players who want to fight in local wireless battles need to make sure they have the same software version.
・ There is replay compatibility with Ver. 6.1.0, but not with Ver. 6.0.0 and earlier. If you want to keep your replays from Ver. 6.0.0 and earlier, convert them into videos before installing the update. You can do this via Vault → Replays → Replay Data → Convert to Video.
How to Update
1. Highlight the software on the HOME Menu and press the + Button to open the options menu.
2. Select "Software Update", then either "Via the Internet" or "Match Version With Local Users".