Don't worry to much about 2.6.2. Elsewhere, Kobo have said it is only to fix a problem with recommendations. No other changes.
And the 2.8.1b is about a problem with demo devices. I assume they released it without changing the version number as it only really needed to go on new devices being set in shops for demos. Unless you are reading Dutch books as a Dutch hyphenation dictionary has been added.
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