Hardware My SD card is corrupted ?

[Neyru]

Hi, sorry in advance if my english is bad

I'm going to explain everything because I know nothing. So I have a problem with my sd card. My 3ds got broken and I had to buy a new one. The new 3ds I bought is already hacked but the old one isn't.
I know I did something wrong but I thought the world was simple: I wanted to do a backup of my games' save files on my pc before putting everything on my new 3ds. I thought transferring all the files from the sd card to my pc was enough, but as soon as I put my sd card in my pc it couldn't read it, my pc doesn't show the files and now my old 3ds cannot read the sd card either; and got the "Could not detect the SD card. The software on the SD card could not be displayed" message. That means I potentially lost hundreds of hours on my digital copy of New Leaf, I'm really attached to my savefiles and I don't want to lose them, it's years of my life... Same for the rest, I want to keep my Mii Plaza
I think I can still recover all my savefiles, I just don't really understand how. So I checked and saw some reddit posts about it, and tried using Testdisk to recover everything so my 3ds can at least read the sd card properly again but the only things I can recover with it are photos and .dovecot files (don't know what they are). I don't know if my 3ds will be able to read my sd card even after I manage to recover the files

I tried to see here if there was an old post with the same situation, I hope I'm not asking for something that was already answered. But again, everything seems very technical and I didn't properly understand everything when I checked, and I don't want to make another mistake. I hope you won't mind explaining everything if there is a solution to my problem
Thank youu !! ;;

 

[Kwyjor]

I thought transferring all the files from the sd card to my pc was enough

SD card data is encrypted, so even if your SD cards were working correctly, that would not be enough. You would need to bruteforce the encryption key for your old unit before you can do anything with that data again. There are many, many threads about this.

and tried using Testdisk to recover everything so my 3ds can at least read the sd card properly again but the only things I can recover with it are photos and .dovecot files

I hope you were using Testdisk and not Photorec. You can also try using Easeus if Testdisk doesn't work.

everything seems very technical and I didn't properly understand everything when I checked

If there is something specific you don't understand, then you should ask about what you don't understand. Otherwise you are just going to get more explanations you can't understand.