Hi!
My Hanlin V3 (BeBook, EZ reader, ... all the same) has this option, at least for .fb2, txt, rtf files. It just reverses black and white.
I think that there is a way to make epubs work with the same reading software that reads fb2, but I am not sure. On the bright side - there plenty if converters (like calibre) or even online ones, where you upload your epub and get the fb2 file.
(If you need more info leave me a visitor message, since I might overlook this thread)
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