Revert to previous version of my prezi!

Argh help, just looked at a prezi on my laptop which I created on my ipad. It asked me if I would like to use a theme, so I selected one and now all my data has gone. Prezi is blank!

Are you able to revert back to the blank prezie will all the text but using a blank theme please?

This is the link: http://prezi.com/zlz814n_mzmc/?utm_ca...

Thanks.