It might be possible. The information would be stored in a database file on the device. It looks to me like it could be in /system/explorer-2/explorer-2.db, which is an SQLITE database file. If you know a thing or two about databases, and especially SQLITE, then you could probably change the genre value for a particular book in the database. I don't know how long it would last before the book was probed and the database updated again with the original genre value.
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