On the flashing:
The flashing is something you will have to live with for all E-Ink screens. They have to invert the old image (which means you are going from mostly white to mostly black). This is done to ensure all of the pigment chips are properly aligned for the new image.
Otherwise "ghosting" happens, where some pixels refused to change.
E-Ink shaved a second off of this compared to previous generation displays. Its visually annoying, very slow, and one of the big complaints about their devices.
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