No, the update is not necessary, yet, certain steps are dependable from the current hub firmware version
This step has been removed and it’s no longer available in the app.
Device must not be added to any climate zone to be able for setting the HOLD mode. Heat Controller assigned to zone may be set to HOLD by setting the whole zone in such mode.
No, it is not necessary – battery level will be displayed automatically.
No, it is not possible at this moment.
It is an information about the current connection mode. Local label means that your mobile device and hub are both in the same network.