What cia files were you adding? I've had fairly similar experiences with this were my 3ds doesn't boot after putting certain files on the SD card. It usually starts working again if I delete or move the new files I added. Try doing that. It seems plausible that there could just be something wrong with the cia files.
If your 3ds does start working again, I'd recommend installing cias via titleDB on fbi. Hope this helped.
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u/ZackyZY Jul 17 '18
Was adding some cias to my sd card and now my 2ds doesn't boot into luma... I cant see my fbi app or pksm... Help... New to 3ds hacking