This tool writes .img files directly to SD cards or USBs.
: This is currently the most active source for modern builds. You can find ISO files for Android TV 13 SourceForge page Archive.org : Hosts a large repository of older, stable versions like Android TV 7 , 8, and 9 (Pie) android tv iso file download
You can run Android TV in a virtual machine, but the experience is terrible (no hardware acceleration for video, no remote control support). This tool writes