Hey I literally made this account to post here and say thanks. I had a corrupted Fire Emblem Fates: Birthright cartridge and literally homebrewed an old 3DS just to try this, and it fixed it. Thank you!
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi