@davidfor: thank you very much for the image! Unfortunately it didnˋt help. Might be a problem with the hardware. Display is frozen showing the last book I read. Saying "turned off (in German: "ausgeschaltet")". After turning start button to the right the lamp between the light button and the start button shines for 1 second and then blinks 9 times before it goes off. Nothing more happens. Maybe I try new sd-card and flash the image on it. Or does anyone in the forum had the same problem and have an idea?
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