Make sure you are using the correct bin file. If your K2 is the international version you need to use the K2i.bin file. I had the same problem until i realized there was a difference. On the K2 international the k2.bin files don't work and remain grayed out. You can tell if it is an international version by looking at the serial number on the lower back of the kindle. If it starts with B003 it is an international version and you will need to find the K2i.bin files for it.
Hope this helps.
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