The update from firmware 1.3.2 to 1.3.9 started hours ago, it is still in update mode and not reachable. The router (fritzbox) indicates, that connection to the internet are active, but I can not see what is happening. The update is running now over 2 hours, I'm sure nothing will change.

What can I do now?

The notification "Do NOT power off your smart device ..." is still in the android app (latest playstore version).