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thank you for all these precise answers.
- for the sd card question: I tried another new card from another brand ... no better (the kobo is indeed a glo HD, but actually I also have a kobo glo that I succeeded to be repaired a few months ago).
- the battery is ok: when I turn on the reading light, the LED lights up in red and stays on ... for a long time (I didn't wait to see when it goes off). when i turn off the reading light, the led goes out. if I unplug the battery and plug the reader into the usb / mains socket, it's the same thing. If the screen is plugged in incorrectly, does this prevent the reader from booting?
- formatting the root and book partitions with the kobo reset maneuver does not make the screen react.
- I rubbed the contacts of the location of the sd card a little. can we clean with isopropyl alcohol? or contact bomb?
- I'm sorry to bother you with all my unsolvable problems, I will soon put my brick in the trash ...
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