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Some time ago another user posted a guide about how to flash Brillo on Edison; he mentioned that he was able to flash the image successfully. I recommend you to check his guide; it might be helpful for you: Brillo OS - Successfully Flashing. Anyhow, the official image supported by us is Yocto. If you have questions regarding the Brillo image, I recommend you to contact its developers directly: Brillo | Google Developers
It worked for me..