I can't restore dp6 backup with dp7

hello everybody,

I just entry to work in a new entreprise, it work with dp7, and today I must restore a old backup, but it is make the backup with dp6, I put cartridge inside the tape library robot, and dp7 see them but I can't import catalog and see objets inside them, there are a question mark in the cartridge and only I can format them, there are any way to restore dp6 backup from dp7?

thanks, and sorry for my english.

Michael A.