Updating (or at least trying to) Home Assistant Operating System from 9.0 to 9.2 has apparently bricked my HA installation 
I can access the shares on my Pi4 but that’s it.
I’m on nabu casa and it’s not responding either. Just a HA logo in the middle. No “Retrying in n seconds”.
I’m wondering if my only option is to do a clean reinstall and setup all automations again?
Running a “ha core check” just sits there Processing… I haven’t done this before, but it’s been processing for several minutes now. How long should I expect a core check to take?
EDIT: After about 10 minutes it returned this:
Post "http://supervisor/core/check": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
Doing a ha core rebootfrom the command line returns this:
[core-ssh ~]$ ha core reboot
Processing... Done.
Error: Unknown error, see supervisor
The last entries in home-assistant.log are these:
2022-10-13 16:19:13.838 WARNING (MainThread) [homeassistant.components.hassio] Can't read Supervisor data: System is not ready with state: shutdown
2022-10-13 16:19:49.166 ERROR (Thread-12) [pychromecast.socket_client] [Stue TV(192.168.0.192):8009] Failed to connect. No retries.
2022-10-13 16:19:49.169 ERROR (Thread-15) [pychromecast.socket_client] [Bedroom Chromecast(192.168.0.228):8009] Failed to connect. No retries.
Has anyone got any suggestions to how I get it running again? Rebooting my Pi4 does nothing - no additional entries to the log.
Thanks in advance 