Items featured in the update include:

• A tool that allows Nintendo 3DS users to transfer save data from the packaged version of a game to the downloadable version. Players that originally purchased a physical version of a game will be able to pick up right where they left off with their save data if they decide to purchase the digital version of the same game. Save data that is transferred to a digital game cannot be moved back to the physical version.

• An improvement to the feature that downloads items in the background when the Nintendo 3DS system is in Sleep Mode. Items will now download when the Nintendo eShop is running. Users can simply close the system cover to activate the "Download Later" feature and the game or application will begin to download.

Direct link: http://www.nintendo.com/3ds/system-update

Source: nintendo.com