HA OS 9.4 won't boot with HDMI monitor display connected to Raspberry PI 4 · Issue #2303 · home-assistant/operating-system · GitHub
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HAOS 8.0 fails to boot after update on Raspberry Pi 4 Model B 2GB ARM with a WesternDigital Elements SE SSD 480GB · Issue #1917 · home-assistant/operating-system · GitHub
![bootloader - Raspberry PI 4 not booting, ACT LED blinks 4 times, boot recovery won't help - Raspberry Pi Stack Exchange bootloader - Raspberry PI 4 not booting, ACT LED blinks 4 times, boot recovery won't help - Raspberry Pi Stack Exchange](https://i.stack.imgur.com/1uMUE.jpg)