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Originally Posted by John C
I was wondering the same thing. The auto brightness was also unpredictable. Sometimes it works sometimes not. Its defiantly brighter at the bottom than the top and mine has the exact same yellow top third. The sharper screen might make up for it to others. The worst part was waiting a month for a buggy device! Some things don't change! I have enjoyed reading the forums and have to wait to see which ereader is best for me.

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I'm no expert but my guess would be the colour change across the screen would be down to colour variance between LEDs or whatever they use as a light source or some other hardware issue. So I dont think software would fix this.
Auto brightness - I'd suspect theres a better chance that that is software relates or could be fixed that way.
But all this is just a guess...