The powercover maybe can't be updated. The pogo style 4 connections are power and charge info, not USB.
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E Ink Kaleido 3 is far from a mature technology.
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It's quite old tech now. It's simply inherently very limited as it's a 2 x 2 repeated array on a regular eink panel. It's never going to be much better though would be most improved by a 600 dpi mono eink instead of the current 300 dpi mono eink.