Cannot restore old Whatsapp .db.crypt file

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http://androidforums.com – My phone was deleted a few days ago, and I want to recover some specific conversations from Whatsapp. The issue is that the latest .db.crypt file I got is from July, and I do not know if the new version of the app has changed anything, but there is absolutely no way the phone recognizes an existing backup when I reinstall Whatsapp. I have tried several times but no luck at all. Any help appreciated. (General)