Thank you for the answer, it works when I use the ez-fet while I wiring emulator from eval board with RST and Test signal. however, I am still not sure why FR69891 didn't work with my MSP-FET , the MSP-FET is working when I use the same schematic structure to program MSP430FR59691 , so i guess the USB MSP-FET is working fine. It just don't fit on MSP430FR6989 , it is so weird.
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