Since being updated on September 18, 2017, the Nintendo 3DS has gone months without an update, but at long last a new one is out and it’s the same patch note like the previous 19 updates all consisted of:
Nintendo 3DS Firmware Version 11.7.0-40U: [Released 06/18/18]
- Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.
Source: en-americas-support.nintendo.com