i can't update through luma, what can i do to fix it?

I don't have my 3ds out to check, but it's possible that the updater is outdated. manually changed the boot.firm on the sd card, then do the same for the ctrNAND.

 

https://github.com/LumaTeam/Luma3DS/releases

your updater is outdated. I just checked mine. it's version 3.5. replace the boot.firm on the sd card with the one from there. also, replace boot.3dsx for the homebrew launcher. rosalina will still work but it needs to be updated for use with the homebrew launcher.

 

Take a look at this thread. Believe this is your exact issue.
https://gbatemp.net/threads/luma3ds-updater-version-2-5-fix-version-2-4.559138/
(the solution @godreborn suggests is correct though, but perhaps you'd like a little more guidance on how others dealt with this in the past)

 

Or download the latest version of Luma Updater, then install the .cia file through FBI and later open the Updater and finally update Luma automatically.

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Only mark the "Show NAND or user string..." option

 

it depends. I'd suggest the option to add sys instead of ver to know you're on cfw, as well as locale (some out of region games don't work without it). I think dragon quest viii is one of them.

 

Update Luma Updater manually, your version is too old and doesn't work anymore.
Edit:

 

install a newer version of the updater through fbi. I'm using 3.5 I believe. yours is very old.

 

Latest is 2.5, indeed

Please read the another people posts above

 

2.5 I mean then. it will install to ctrNAND, but you can also install that with godmode.

 

install the latest official update. even if it didn't work, all you have to do is replace the boot.firm.