https://plus.google.com/+JeroenPluimers/posts/VfAYwFMj58s
“Amlogic S905 processor used in many Android TV boxes and ODROID-C2 development board implements ARM TrustZone security extensions to run a Trusted Execution Environment (TEE) used for DRM & other security features. However, Frédéric Basse, a security engineer, worked with others and managed to bypass secure boot in one Amlogic S905 powered Android TV box, namely Inphic i7, but any other device based on the processor would have made the same thing possible. […]”
http://www.cnx-software.com/2016/10/06/hacking-arm-trustzone-secure-boot-on-amlogic-s905-soc/
Firmware Security 