I don’t think the update has damaged your device.
Have you tried reinstalling OSMC?
If you have command line knowledge, you could move your Kodi user data directory away.
The most common reason for black screen after the OSMC splash screen is that the user has selected a resolution which is not compatible with their display.
I remember that you had signal issues in the past and would recommend you check the advice there: Vero 4k+ Blackouts.
Sam