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Originally Posted by Laura81
Right now I have no idea. I don't know that the firmware between the K3 and K4 are even all that different currently. I just thought that if a firmware were brought out later that supported a different format or prolonged battery life, etc I should get a device that would be able to take advantage of that firmware.
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From what I can tell the K3 and K4 are essentially the same firmware with a few minor changes, most of which are to accommodate the new keyboardless interface. That is, the K4 without a keyboard had to have a few Menu changes so it would be able to do what the K3 does with a keyboard.
The K4 has some updated hardware, mostly good. It has a faster processor for one thing. But it also has a smaller battery than the K3, a downsizing if you will. So plus and minuses in the hardware comparisons.