If Google translated your post correctly, you are asking if Mediaroom 1.6 is needed to upgrade to 2.0?
Well, not necessary, if providers have a 2.0 DRA avaliable, but all of them have 1.6 on DRA, so you need to upgrade to 1.6 first, then it will upgrade to 2.0. This happens because upgrades are not being "forced"(yet) on the login/discovery process. Instead they are sending mediaroom notifications for clients to upgrade at random intervals to avoid overloading the update server.
If you are running mediaroom 1.2 you also need to upgrade to 1.6 first, because(at least in Portugal) 1.2 login is no longer configured at PT mediaroom servers anymore.