We have two Aura HD in our house. They were both upgraded by performing a factory reset, then allowing Kobo Desktop to upgrade them to 3.15, and then sideloading 3.17 by putting the update files in the .kobo directory. The upgrade on one reader completed without incident and it can be used as normal. The other, with 3.17 installed, continually reboots such that it is unusable.
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