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i solved with sd-rescue:
- device charged
- possibly format sd card
- extract sd-rescue pack in the sd-card: the results is you have "firmware OS" folder only in your sdcard
- put the sd card in your device
- wait the next reboot
- when screen become white, before the opening book loading, hold and keep hold HOME and MENU. Keep old unless the loading bar is full (total black from left to right)
- than wait 20 -30 minuts (or 1h if you think is more secure) when the loading bar is white and dont reboot, hold reset and then home to reboot.
i solved in this way, hope works also for you. (sorry for the english)
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