Essaye ça :Oso tu peux m'expliquer clairement en français stp mdr, je galère
If your console is PAL:
1. DO A NAND BACKUP OF YOUR CONSOLE AS-IS. It wont save you from this, but... If you mess it even more, you will be glad of having it.
2. Redownload the EUR O3DS 9.2.0 CTRTransfer and put it on a clean SD.
3. Do the CTRTransfer.
4. Reboot.
5. Change the secureinfo with Godmode9 (go to region changing on 3ds.guide for instructions) (or find somewhere a EUR Secureinfo_a file and inject it with Decrypt9)