Finally I was able to install the latest firmware (2014-10-14) on the 3rd attempt. This time I
- removed my books from the internal disk
- upgraded via the settings dialog
- copied back the books
Maybe there was not enough space left for the upgrade on my first two attempts, but that is just a wild guess. Prior to removing the books the drive was 87% full, at the time of the successful install it was at 53%.
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