Version 6.1.0-12U available via wireless Internet connection includes the following improvements:

Changes to StreetPass Mii Plaza:

The option to update StreetPass Mii Plaza is now available from the Streetpass Mii Plaza menu
- Updating StreetPass Mii Plaza will provide new features, such as the ability to change your Mii character's expression and the ability to purchase new StreetPass Mii Plaza games*

Improved system stability and usability:

Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience

*The ability to update within StreetPass Mii Plaza and purchase paid content is only available to users in countries where the full version of the Nintendo eShop is available.