Just got this message for a new system update a little while ago. It is not the same update that came with the eshop not accepting cards anymore as I have already
How to Hack a 3DS: A Simple Guide to Homebrew, CFW, & More
3DS update out now (version 11.16.0-48), patch notes
2DS/ New 2DS/ 3DS /new 3DS Luma CFW Modding Service Mail - Etsy