Lost backup
Hey, before some weeks I downloaded and updated to iOS 14 Beta Version. Due the many problems of this version I wanted to downgrade to iOS 13 until the original update is available, so I backuped my iPhone in my computer (windows pc) via iTunes. I set my phone back to iOS 13 but when I tried to transfer the backup in my iPhone, iTunes didn't let me ''because my iphone is old''. I changed the backup product version from 14 to 13 and tried again. It didn't let me once more because it asked for a backup password that I never set... Maybe I chose my backup to be encrypted but I didn't set any password for this. So now I have an encrypted backup on my computer and an empty iPhone. Any help?
iPhone 7 Plus, iOS 13