The DX is not a flagship product, it is a niche product. While there is some overlap in those two categories (flagships tend to be expensive and through that slightly niche) that is not the case here. The DX Graphite is simply the DX with a newer generation screen and a different colour case. It wasn't apparently worth producing a real new version. Thus the DXG is second generation hardware, and is limited to second-generation firmware -- which means 2.5, same as the Kindle 2.
You knew when you bought it that it had second generation firmware, and thus hardware, and even a remote modicum of thought could have told you that there was never going to be an upgrade to 3.x in the future.
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