Hi Tamas,
The i.MX6 SABRE-AI does not have eMMC on board, so, you could try with a different boot option (like a SD card).
Anyway, please consider that you need to download the root file system, and a specific U-Boot for any platform / boot option, like the described on the following thread:
i.MX6qp Sabre AI cannot boot the validation sdcard image
Hope this will be useful for you.
Best regards!
/Carlos
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