I managed to solve the problem. I enabled ADB and connect to the Wall Display. I did not change anything as far as I know. But logging into the Wall Display and running the deamon probably solved the problem. The other possibility is changes to my wifi network; I upgraded one of my AP's so probably the Wall Display and/or Home Assistant changed subnet.
I don't know if the problem of this thread is resolved now. Genom33 should react on that.
I have exactly the same problem. Occurred after update to fw 2.3.4. (20250212-115015/2.3.4-a71e59c7) White screen on Home Assistant. De HA integration still works, the device is still visible and I can operate the built in switch. But the HA dashboard fails to load. Tried reboot, factory reset but no luck.
Here some log info:
[2025-02-24 20:33:13.824][HomeAssistant] HA discovery started
[2025-02-24 20:33:14.031][Generic] Found HA service: Thuis at null:0
[2025-02-24 20:33:14.061][HomeAssistant] HA discovered: http://192.168.188.32:8123
{location_name=[B@cecf09f, base_url=[B@c2d15ec, external_url=null, internal_url=[B@c686db5, uuid=[B@8e20c4a, version=[B@339f7bb, requires_api_password=[B@ecba4d8}
[2025-02-24 20:33:18.826][HomeAssistant] HA discovery stopped
[2025-02-24 20:33:20.980][HomeAssistant] ?? item is checked, it's instance is {"name":"Thuis","scheme":"http","address":"192.168.188.32","port":8123,"path":"\/","query":""}, the instance is configured, but I will not process it. (Insert Ryan Raynolds' 'But why' meme here)
(the last line is also part of the log 
Please help, thank you!
