HI, i've accidently cleared my device and now all the stock photos, /pictures, songs, videos are all gone .. i dont know what else is gone i just saw those.. Although the apps like FB,TWT, AngryB, GOFS etc games are all there...

I tried reinstalling the software via software updater, no luck then i receieved the pr1.1 update and still those wallpapers, videos and songs are missing .. how do i get em back ?