As far as I know from yifanlu's explaination, K3 firmware does not run DX active contents because the format is different. Changing serial number allows your kindle to download k3 active contents.
This is probably because K3 and K2 have different drm mechanism or different API. Either case, since you got both k2 and k3 binaries, it is possible to find a work around if you do enough reverse engineering. In the worst case, you can emulate or dual boot to k2 from your k3.
Otherwise, you have to change sn
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