
you can install b9s on any FWSo basically I'm on 11.5 Luma 3DS (with a9lh I think?; v7.0.5), but a few months ago I forgot to install B9S before updating.
Can I install B9S on my New 3DS with Luma, even if it's s on 11.5? Thanks in advice!

Your OFW does not effect B9S. B9S is installed far deeper than the OFW can even dream of touching.
So you can safely update from A9LH to B9S
https://3ds.guide/a9lh-to-b9s
Ok, thanks!you can install b9s on any FW