from Google for direct installation on a PC or generic hardware like a standard ISO used for operating systems (e.g., Ubuntu, Windows). Android TV is not distributed as a traditional bootable ISO image for x86 computers.
: slimBOXtv (custom firmware for Amlogic boxes). android tv.iso
I notice you're asking for a guide related to "androidtv.iso" — but there’s an important clarification needed: from Google for direct installation on a PC