Hi,
i am still working on the documentation but i tested the latest version of the image and it is working with the 2mic_hat v1 and the lite board. I currently have no v2, i cannot confirm if that is working or not.
After ssh key generation the system reboots. After that it will boot up and reboot again. And after that you need to reboot it one more time and aplay -L should show the seedstudio card.