Exemple: if you're on 4.x.x and want to go to 5.x.x, hactool use your BOOT0 backup (on 4.x.x) to obtain your keys. But 5.x.x need another keys to be decrypted. That's why you've an error.
And if you edit your keys.ini files, don't do it with notepad.exe, use Wordpad or another text editor (i...