Guys I need help. I also have the same problem. My luma version is 7.1, everytime I tried to update using luma updater, it still shows 7.1,. So I tried to manually change the boot.firm at sd root to the latest firm (version 8.1), when I use the luma updater, it still show the version 8.1
Then I try to change the boot firm at ctrnand using fbi by copy paste it.,and my 3ds wont turn on. Then I use the solution posted here, by replacing the boot firm at sd root to version 7.1, it can turn on. Again, then whenever I update it using luma updater or manually, it wont turn on..
What should I do to update the luma to latest version? Should I delete the boot.firm in the ctrnand? I'm new to this btw