restoring from 4s to a 4
i lost my iPhone 4s but have an old iPhone 4 which belonged to my wife - i have tried to restore my old 4s contents onto the 4 but it wouldn't let me and suggested that i didn't have the latest update. i then restored my wifes settings and tried to update the iPhone 4 and there was not one available!!
how do i get my 4s backup on to the 4
I am at a loss