Installing Home Assistant OS on PI5: Docker error "exec /init: exec format error"

I want to use HA on a Raspberry Pi 5 using Home Assistant OS and followed this guide.
In the end I could not reach http://homeassistant.local:8123/ nor http://homeassistant:8123/ nor IP:8123, but HA Observer is reachable under http://homeassistant.local:4357/.

As I had keyboard/mouse/monitor connected I ran docker logs homeassistant, which states “exec /init: exec format error”. If I restart, I obtain the same error. If I check docker ps I see that hassio_observer has a port, but the others do not.

The error indicates that I run the wrong image, but it was chosen by the installer. It seems to be correct as well, as I can see that I have the aarch64-hassio-cli/multicast/audio/dns/supervisor containers in docker ps and uname -a returns “Linux homeassistant 6.6.62-haos-raspi #1 SMP PREEMPT Thu Dec 19 12:56:05 UTC 2024 aarch64 HAOS”.
How do I proceed from here?

Setup is a RP5 with 8GB and

  • Crucial P3 Plus SSD
  • Geekwork X1001 shield
    It is connected over ethernet.