Edit: I'm an idiot and just figured it out. Updating NTR Selector was the answer.
Hello all,
I can't say I'm super knowledgeable about the inner workings of 3ds cfw. I installed Luma on a new 2ds a while ago and never really had any issues. After a several month hiatus I've booted up the DS...
Hey I am having a similar issue. Though my error is "Unknown Firmware" detected Firmware 2.56.0
Which is weird because I hadn't had problems but just picked up my 3ds after a few months and now this. Like OP I've also updated Luma and FWIW I'm not having issues with any other homebrew.
Edit...
Nuh it was a joke, but I used to bite my nails when I was young, but when I started doing construction work and seen what crap was under my nails, I stopped.