Quote:
Originally Posted by jhowell
The cover thumbnail feature for personal docs only works in the latest 5.15.1 firmware. It will not work on Kindles that have not been updated or on older models that cannot like the Voyage.
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Thanks! Turns out, the Oasis and Kindle 10th Gen. CAN be updated to 5.15.1, but they hadn't. They had updated recently, after I hadn't used them for a while, pulled them out, charged them, and connected to wi-fi. But they didn't update to 5.15.1. I've updated them manually, and the covers work! So, ePub (reconverted to ePub in Calibre), change file extension to .txt, use Send to Kindle app so you can set the title & author correctly, and covers, bolding, everything works great.
My kindle Voyage, on the other hand, can't update to 5.15.1. I might sell it... I have too many kindles anyway.