Encryption Trouble - Fedora 35

After some months in which I didn't use Joplin, I install the version 2.8.8 in my Fedora 35 laptop (previously I used Joplin in a Fedora 33 laptop).
I have a lot of encrypted notes that I backup in a local directory.
So I import the notes, but despite I saved all the (Master) passwords...they don't work...totally useless, I did something wrong.
It's possible to recover these passwords in info.json file or another one?
Thanks

It seems there's not solution for this issue...

How did you backup your notes?