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You're looking in the wrong place to do this. I think this can be done directly on the reader without touching the books.db database.
In Explorer locate the 'database' folder on the T1 and then open the 'cache' folder, followed by the 'books' folder. In there you will see a folder for each book on the reader. The folder name equates to the '_id' field in the books table in the db. The numbered folders contain yet another folder called 'thumbnail' which in turn has a copy of the cover jpg/png in it.
I haven't tried this, but I can see no reason why you can't either delete the existing graphic thereby forcing the reader to add it again or copy your new cover file into the relevant book's folder.
You should take a backup of everything on your reader before you try this, so that you can restore things if my suggestion doesn't work.
And the same procedure will apply to a microSD card if you've got one installed.
Hope this helps.
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