PiKVM-A4 is one of the members of [[PiKVM]] family, it only supports Raspberry Pi Zero 2 W without a matching metal case.
!!! warning "ZeroW reached EOL and is no longer supported, the last image it can be found [https://files.pikvm.org/images/v2-hdmi-zerow-latest.img.xz|here]"
Or you can refer to [https://docs.pikvm.org/building_os/ | here]