I just put firmware version 4.28.17623 onto my Glo HD. Then I added "DarkMode=true" into the "ReadingSettings" section of the config file. As I should have guessed from where the option is, it only affects reading. And as discussed, it does not affect images.
Hopefully this will be an option on the other devices soon. It won't surprise me if it isn't in the first post-Elipsa firmware release for the other devices to keep it as an exclusive function. If Kobo has another device planned for later in the year, it might happen after that.
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