Originally Posted by geekmaster
USB Downloader mode does not write to the eink display.
I am learning more about that as time passes.
USB Downloader mode is running the $10 SoC part as if it was a (rather dumb) $1 micro-controller.
It can start up the off-chip ram, the off-chip rom, run the serial or usb port ...
That's it folks. (So don't expect it to turn on the battery management or anything else.)