Solution: I was runnung OS 4.2.1.
In November that support was added:
27.11.2010: libimobiledevice 1.0.4 has been released. One important change is a fix to connect to iOS 4.2.1 devices.
Standard packages are using 1.01.
Find new packages for
openSUSE 11.0, 11.1, 11.2, Factory or 1-Click Install
Fedora 12+ (Packages in the official repositories)
Mandriva (Packages are available in "Cooker")
Ubuntu (Karmic, Lucid)
or the source file at: