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You didn't tell what adapter you connected when trying to program through J4. An USB Blaster?
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Ya, I am using USB blaster Rev C and try to access the J4 with the JP8 had already been shunted. It seems like this port is working with the board that labeled 6xx-4133R-0D, but failed with 6xx-4133R-0B. This label can be viewed on the bottom of the board. The sticker of 6xx-4133R-0D is covering the original board printing 6xx-4133R-0B, as 0D's board comes with the extra 10pin male header, while 0B's board doesn't and one must solder the pins by himself.
I think this is a hardware bug. :mad:
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