I have bad news for you.
https://gbatemp.net/threads/9-3-0-21-nintendo-3ds-update-released.375613/page-26#post-5198404
That's what we call a partial update. Happened to a lot of 4.x systems where someone did that and ended up not being able to use gateway even though settings said 4.x. unfortunately generally the stuff that blocks hacks is made to install first
I hope that it didn't happened. That's also a little annoying that i can't see if i'm am on a partial update or not...
Nintendo is a real demon !