Looks like if you have an Echo v1 you should be able to install Debian on it: https://github.com/echohacking/wiki/wiki/Echo. It does require attaching to the debug pads on the bottom of the device. I’ve not yet found anyone who has actually used this for anything other than listening into the device itself (would love to see if you can still access the speaker and mic etc…). It appears that the echo v1 runs on Linux while all later ones run on Android.
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