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I saved everything and I tried to change the password immediately as suggested.

However, after I changed the password I couldn't login anymore with either the old or new password.

Then later I discovered that when I changed the password, all the keys related to the account were equally changed. I didn't know that's what's going to happen.

I thought only the password would be changed and I only backed up the new password. I didn't back up all the other new keys.

I guess you're not going to help? Should I forget about it or there's the hope of a recovery?

Thanks.