Don't know about the technology but my guess is it is possible to adjust contrast in the older generation E-ink because when I close a dictionary window in a pdf file the previously covered words became darker than the rest of the page. My speculation is if one can disable the grey scale - render all text to the darkest as default then the contrast will be great.
But it seems that Pocketbook developers never thought this was an important function for their costumers.
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