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"Invalid page" usually results from damaged book file. The Reader's firmware sometimes corrupts data in its internal memory, for example, truncating the book file at 0 bytes. Other common cause is a corruption of the device cache. It is usually enough to delete the book's file and upload it again under a different name, but it seems that when "Invalid page" happens, the Reader becomes unstable and tends to reboot fairly soon; deleting the cache file has always worked fine for me, though.
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