Good news! Nintendo official team updated the 3DS system to V11.5.0-38. Below is the statement.
Version 11.5.0-38U available via wireless Internet connection includes the following improvements:
Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience
We have tested on our 3DS console, it’s confirmed SKY3DS & SKY3DS+ support the newest 3DS firmware V11.5.0-38 without any problem, you can rest assured to upgrade.
SKY3DS PLUS with Shingeki no Kyojin
SKY3DS with Rhythm Tengoku
Besides, sky3ds+ has changed the stickers, and it will come with a skydock, welcome to visit http://www.digimartz.com/