Sorry, the video doesn't really show anything. It shows the dancing squares which are normal when you start a Kobo device. Then the screen goes black. Does it power off? Something else? There is also no indication of whether you had simply turned it on, or done something else. Or what happened after you tried to install the update.
But, you will probably need to do a manual factory reset as describe on
https://wiki.mobileread.com/wiki/Kob...Aura_Edition_2.