Leave the Partition Scheme as and Target System as BIOS or UEFI for maximum compatibility.
There is no single "official" Android TV 13 ISO for all hardware; the method depends on your target device: For PC/Virtual Machines: android tv 13 iso install
If the network option is grayed out, your computer's wireless network interface card lacks driver support in the OS kernel. The easiest workaround is using a wired Ethernet connection or a driverless USB Wi-Fi adapter. To advance your project, please let me know: Leave the Partition Scheme as and Target System