Open the case (four screws under the rubber feet). Look for a silkscreen text like "V1.1," "V2.0," or "X-Pro."
An operating system like Linux needs to know exactly what hardware components are on a device's motherboard. On traditional computers, the BIOS or UEFI handles this mapping. Budget single-board computers and Android TV boxes do not have a standard BIOS. Instead, they use a Device Tree file.
However, you will need to interact directly with the dtb.img in a few common scenarios:
Go to the official EmuELEC GitHub Releases and download the version corresponding to your device chip.