Just to add a new element: if I disconnect the controller BEFORE launching koreader, when I go back to the home screen and connect again, bluetooth works.
So it looks like if I've bluetooth device connected AND I launch koreader, the bluetooth breaks: the controller keeps on showing the solid blue led like it is connected, but if I go in BT settings, it is off and I cannot turn it on anymore! Only way to fix it is to reboot the Kobo!
PS: Also tried to switch WiFi off/on with no success: bluetooth cannot switched on.
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