I have changed hundreds of covers with Calibre then connected KT and let it connect and update meta data. Right click on Reader device icon in Calibre select eject device. Wait less than minute after reader divice icon disappears then unplug KT. Often I get tired of waiting for KT to update so turn KT off then back on. After spinning working indicator disappears new covers will be displayed when each book is selected. Don't know or care about details how or why this works. Glad it is so easy. Calibre is great program I depend on. I need to give them money.
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