Well, on one of our Aura HD it is impossible to patch 3.17 to make it usable, as the device continually reboots within a few seconds of the home page appearing after it is started up - too quickly to manage to insert a USB cable and tap the "Connect" button. If I boot it up with the cable already connected, the "Connect" button appears, but the device appears already frozen as there is no response to tapping on it, and the device reboots again within a few seconds. I've twice performed a factory reset, then used Kobo Desktop to install 3.15, then put the 3.17 files in /.kobo to upgrade, with the same problem each time.
Used the same procedure to upgrade the other Aura HD in the house to 3.17 without any problem, and have had no problems using that reader since the upgrade.
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