How to do this is simple. Just open Fouad Whatsapp and navigate to Settings > Chat History > Backup Chat History. Once the backup is complete, delete the Fouad Whatsapp app. Go to File Manager and create a folder named Fouad Whatsapp.
Open that folder and you will see that each subfolder has the prefix FOUAD in its name. Rename every folder and remove prefix of Fouad from them. After that install original WhatsApp application and fill up your phone no. Click on restore. And your all chats and media will be restored as previous.
By the way, check that the internet link is properly linked, otherwise the program will not work.