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TMS320F28379D: not able to erase and program flash

Part Number: TMS320F28379D

Hi Team,

My customer face an issue that they are not able to erase and program flash on their several new board based on F28379D,while they can connect the board to CCS successfully and download the code to RAM, they verify the power supply is ok and there is not over voltage condition that may damage F28379D. also the device is unlocked, they can watch the flash value in CCS, the error when download the code to flash is showed as below, is there any reason that they can connected the device to CCS but can not erase and program flash?