The term "ISO" usually refers to a disk image used for PCs (x86 architecture). Because ARM devices (like Raspberry Pi, Orange Pi, or generic Android boxes) use specific firmware and bootloaders, you will rarely find a file ending in .iso . Instead, look for: Raw disk images for SD cards. .zip files: Flashable packages for recovery modes.
Most Android TV features (like Netflix 4K support) require Widevine L1 certification, which is tied to the hardware and not included in open-source ISOs. Top Sources for Android TV ARM Images android tv arm iso