The latest firmware update for the 3DS is now available to download. Version 11.4.0-37 is out now.
Similar to past firmware updates, your 3DS will now be more stable than ever. Nintendo’s official “notes” are as follows:
Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience
If you want to access the 3DS eShop, you’ll have to update to the newest firmware first.