Hi Takeshi! I remember a similar case that was caused by a faulty supply connection between the FET and the target. This does not need to be the same here, but I would check proper connections first, just to be sure. Back then, the Vcc line did not have contact and it looked like during a few tries to access the device the capacitors on the target board got charged via the protection diodes of the MSP, finally having enough energy to establish a connection for a short time. Dennis
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