A friend upgraded my device to iOS7 Beta. It didn't work properly so I downgraded it a few days later to iOS6.

Is it possible to restore an iPhone from a iOS7 Backup if you downgraded it to iOS6?

Hope anybody has tips for me, am very inconvenienced.

I have a Backup op iCloud en op OSX.

This message shows;

To restore this iPhone from this backup, you must first set up the iPhone as new and restore the software to the latest version.