Download Armbian with HA (v24.11) Then boot the image, wait few minutes and login via http://ip_address_of_armbian_running_ha:8123 (official onboarding manual)   Home Assistant Supervised is, more or less, a full blown Home assistant.   Main difference between HA OS and Armbian with HA is that underlying OS here is clean Armbian Debian Bookworm and there is custom dedicated buildroot OS that is provided for a few single board computers, primarily for Raspberry Pi.