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e-ink will display whatever was last written to it for years, perhaps forever.
so unless something gets written to that area of the screen, it will show what was last written.
The Kindle hardware can do 'zone updates' of the screen.
Does the message disappear when you open a book?
That would have to clear the area that 'updating' was last written to.
Does the message come back when you close the book?
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