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I've noticed the "updating" cycle often doesn't complete, on either my Aura HD or Touch 905B, since upgrading to 3.18. It may be a database issue, or it may be a firmware one. I haven't personally bothered enough about it yet to go through the hassle of factory resetting, upgrading, reinstalling and recreating all my Collections memberships -- the true pain of Kobo databases apparently being so fragile. If the next firmware doesn't address this, though, I probably will have to. In the meantime, I've found (once I've left the device long enough to be sure it's not just chewing on a particularly meaty cover image, and in fact isn't going to refresh its own display), that pressing the Home button on the Touch or sliding the sleep slider on the Aura HD is enough to bring the device back to itself.
As for updating with new copies of a book sideloaded over an older copy, I've never found that to work. The only thing that works imo is to delete the unwanted copy, reboot the device, and then connect it and sideload the new one. (I reboot because the device often doesn't seem to delete the record of the book until you do, and I've had instances of simply deleting the book and connecting, then copying the new one over, only to find the old cover had been retained, even though it doesn't actually exist in the new copy. So I always shut the device down after a deletion. In fact, if the book I'm deleting has annotations or bookmarks, I find it necessary to delete them, then reboot, before deleting the actual book, or else they're retained and applied to the new copy.)
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