Backup Help Please : Downgraded to iOS 7.04 from 7.1 Beta 1 on iPhone 5S

Hi all, i can't figure this out so much after reading lots of forums on internet.

i have an iPhone 5S on 7.1 Beta 1 that i downgraded to 7.04 successfully.
I am using a Retina Macbook Pro with lastest updates.

Now my backup from 7.1 beta 1 won't work in 7.04 when i am trying a restore...
iTunes say :

''The backup “User X” cannot be restored to this iPhone because the software on the iPhone is too old. To restore this iPhone from this backup, you must first set up the iPhone as new and restore the software to the latest version''.

Then i red on a forum that you have to open the info.plist file on your backup files and change the keychain product from 7.1 to 7.04.

but still nothing...

So how can i get iTunes to restore with my 7.1 beta 1 backup to 7.04 firmware ?

 

Thank you so much, it worked !

i figured out what was my error :

its not ''7.04'' it is ''7.0.4'', then the backup is recognized and you have to choose ''use oldest backup''