In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zoot wrote:

I had this happen and it turned out I just had dirty gunk on the header of the SX-Key. Before cleaning = all debug buttons grayed out. After cleaning = good.

As has been written elsewhere, *programming* the chip with dirty/poor connections may work, but the higher comm. speeds involved in debugging may fail.

Just another possiblity....

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