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For sideloaded kepubs, the cover image needs to be identified in the OPF file. The extended driver attempts to find the cover and add a property to the definition in the OPF. If the extended driver can't do this, the device will use the generic cover you are seeing. The main reason for this not working is that the cover is not defined in one of the expected ways in the epub. But, adding the cover using the Modify ePub plugin should have set the cover up correctly. To have a guess at why it didn't work, I would need to see the original epubs.
Some things that might solve the problem are:
- Powering off the device and restarting. The covers can be cached and this is the simplest way to clear the cache.
- Deleting books and resending them. If this still has problems, change the driver options to send the covers with the book. With this, the driver generates the images and copies them to the device.
- Use the cover upload options of my Kobo Utilities plugin.
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