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Two other "demo unit" specific points:
The demo units are intended to be on external power 100% of the time;
The demo units call home on a regular basis for both updates to the demo images and updates to the firmware;
If they are allowed to run on battery, it is very likely that they will attempt an update with the battery not charged enough to complete the function.
I.E: Same thing as removing the power from the flash chip while it is still running its internal sequencing.
(Which destroys the device in the sense that its micro-controller can not recover.)
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