Short summary, to complement the somewhat confusing Google translation: This thread is a follow-up to
this one. Currently, there's not much info to go on, just that Calibre only seems to recognize the first device connected after a reinstall. All other devices don't get picked up by Calibre. There's no info (yet) on whether or not the non-recognized devices get picked up by the OS, which I've already asked about in the original thread. The devices in question are all Trekstor Ebookplayer 7.