I looked at the 3.0 source code. In the kernel, all support for the Kindle 2 (and maybe DX, I'm not sure)'s CPU, the iMX3 is removed, and it now supports Kindle 3's iMX35. Maybe the older users get a different version with a older kernel, or a 2.6 with less features. It's not likely that the new DX black is outdated a month or two into the release, but it is likely that the Kindle 2 is now outdated.
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