We did a teardown on one of the Amazon Echo Input devices and the eMMC came off by accident when trying to remove one of the heatshields and so we tried to wire it to a MicroSD adapter and was able to access the Echo's OS on the desktop computer!
The eMMC IC is 11mm x 10mm x 0.8mm. 153 pins, 0.5mm ball pitch and the wire used was 0.1mm enamelled wire.
More info about the teardown is on my blog at
https://www.briandorey.com/post/amazon-echo-input-teardown