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MSP430F2254 bsl Main Memory Command is not responding.

Other Parts Discussed in Thread: MSP430F2254

Hi , I am trying to program MSP430F2254 via BSL .  The mass erase command erase information as well as main memory but i only want to erase the main memory.I have tried  by using main memory erase command and segment erase command but i am getting NACK as response . I am able to erase using the mass erase command though.   can someone please guide how to erase only the main memory. I have tried reading the value at the address of LOCKA bit  but still NACK as a response.

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