Currently only 2 OS are available: BredOS and RadxaOS (recommended as BredOS lacks GPU acceleration)
On the Orion O6 with a live USB or other computer with access to the NVMe
wget https://github.com/radxa-build/radxa-orion-cix-p1/releases/download/rsdk-r1/radxa-orion-cix-p1_bookworm_gnome_r1.output_512.img.xz
xz -dc < /tmp/radxa-orion-cix-p1_bookworm_gnome_r1.output_512.img.xz | dd of=/dev/nvme0n1 bs=1024k status=progress
First boot
sudo systemctl enable ssh
# As by default emoji are not supported
sudo apt install fonts-noto-color-emoji fonts-noto-mono