First: there's no word such as "restory".
Secondly: try to use a proper language so we might be able to understand your currently nonsense.
Third: if your "friend" wants to restore anything he should atleast ask about it here by himself.
Im not even sure if he is talking about a us.de account. @ Marcell:
If he does, he could do it like 1000000 people did before. Creating a new acc and request a password reset. or try to contact dc in any other way. End of the story. But if you havent got reliable proof that its your account its pointless to request any accountrelated Stuff.
Does your friend still know which exact e-mail address he used to register on us.de? Anyway, the server thinks that this e-mail address is invalid. Wait for DC's answer