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Just out of curiosity, did you try to reboot the device without the battery with only an usb cable ? So take out the battery, leave the device for some time( an hour or so) and connect the usb( i did it via my computer). You get some weird blue and red indicator lights, but my dr800 started into the normal man on the circle screen and next into the home-screen, with or without the sd-card inserted.
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