As an FYI, downgrading the Kobo firmware does NOT delete / recreate the database on the Kobo, so if the database had already been upgraded by a newer firmware the database version version number will stay at the version associated with the pre downgrade version. (Ugh.. I did not word that we'll).
That is why you still got the unsupported database message post downgrade.
In any case the simplest approach would just have been to select the driver option to ignore the unsupported database version.
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