Interesting, seeing that jogs my memory, my newer PW4 also came with 5.10.0.2. I wonder if it's because of getting a combination of features that is less popular (32GB, no adds) and because of that, maybe you get one that's been sitting there for a while in some warehouse. I dunno....doesn't matter to me as I don't have a need to jailbreak mine. I upgraded to 5.10.3.

I can't tell any difference between the lighting on mine and the recent Oasis 2 I tested. It's about the same, and ok with me. Both were inferior to the warmer natural lighting option on the new Kobo devices, just my preference.