I wonder if you have a defective Kobo Mini? I have two, and find the screens excellent (I also have a Kobo PaperWhite 3, Kindle Keyboard, Kobo Aura HD, and Kobo Aura). There is no such thing as "brightness" on a non-side-lit E Ink screen; perhaps you mean "contrast"? I'm not sure of a way to adjust that on the Mini, but as long as the ambient (room/outdoor) lighting is good, I find the reading experience excellent on the Mini.
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