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It sounds like your internal SD card is getting errors and switching into read-only mode. There is a thread in this group on replacing the card yourself. It's not easy because Pocketbook have tied each image to the SD card itself, but it is possible to do. One person even had Pocketbook send them a new image tailored to the new SD card he was using to replace the damaged one. Maybe you can contact them and get similar help that way.
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