I did this procedure, the same, man, I'm not a noob.
I'm a PhD student, I'm the left guy of this picture: https://blog.iota.org/welcome-olivia-and-paulo-to-iota-research-796ecd683069

And I can prove my balance: https://ibb.co/fV6Cvb

I just open and close the wallet, I did the backup, but this file is corrupted too.

If some dev see this, please send me an email: pfinardi@gmail.com

I don't want loose my money.