I tried an image I has never used before (Fedora-KDE-armhfp-28-20180325.n.0-sda.raw.xz). And it works.
Good to hear. It seems only gdm (or maybe gnome-shell) is broken (fails to display the graphical login screen.) I just tried the LXDE image Fedora-LXDE-armhfp-28-20180325.n.0-sda.raw.xz and it works fine. The wired Ethernet connection is still broken, but my USB wired Ethernet adapter has no problem.