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I don't know whether this is relevant to the OP, but if you're a Calibre user you can get it to create the T1 thumbnail from whichever cover you've chosen to store in Calibre, i.e. any cover you like. The thumbnail gets created when you send-to-device any book (epub, pdf, txt regardless of whether DRM or non-DRM). The T1 does not then need to try and extract a thumbnail from inside the epub.
You also get choices to:
- retain aspect ratio, or not
- refresh cover thumbnails every time you connect, or not
All this is just a simple one-time setting, see attached
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