1) Normal in those devices. No specially bad but not specially good.
2) Not much, almost nothing if you start dealing with Android stuff.
3) Sold mine, but the "warm" stuff is some kind of yellowness with intensity regulation, not "warmthness" regulation. Enough, but far from Kobo Aura One.
4) Bad. No. In fact, I've sold it and buy a Kindle Oasis.
As a summary, the firmware of the device is very buggy and has a lot of problems. Read my previous posts here.
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