Like he said,
In his notes on the recent release.:P
Look on his github repo. -》https://github.com/KunoichiZ/lumaupdate/releases/tag/v2.1.2
And here, the Kunoichiz's Luma Updater thread-》https://gbatemp.net/threads/release-luma-updater.471739/
Thx you all for your help. I plan on buying a lot of broked 3ds 20€ herd so about 16-20$.
Just for extract the seedfriendcode_b and share tbem To the gbatemp community at Good time and To the good person.
A simply copy/past one file solved the problem for me, the seedfriendcode_b from (B) to (A). I'm unbaned now.
I can play online all games like before like pokemon, ssbm, badge arcade, viewing m'y freins list etc...
I've just unbaned my N3DS XL by injecting the friendseed_b from a ods3. Just copy past the file from od3s To n3ds.
Everything works again, also sumo trading.
All "sharing data options" like spotpass, streetpass are now off. Let's see if get a ban again.