I'm having a pretty strange issue. I don't usually need to ask for help but this one is unusual. I have a N3DS with B9S + Luma installed (latest version of both) onto a 16GB SD Card, and I wanted to transfer to a 64GB SD card. So I followed what 3ds.guide said and copied the files over to the new one. Upon booting 3DS, it says "Failed to apply FIRM1 patches" and forces me to shut down. Other SD card still works obviously.
Yes, my 64GB card is FAT32. Just for the heck of it I tried EXFAT as well and it didn't work of course. I tried various allocation sizes. I took the MD5 of all the files on my new and old SD card and they're identical. It's always the same error message.