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serial download mode(Debug mode), AducM320 can not be program after initially program use the SWDIO and SWCLK

(1) Jlink download Firmware into AducM320 by the Jlink with serial SWDIO and SWCLK 

(2) after ADucM320 running well, then try to download updated Firmware in the ADucM320 again, while can not download whatever the P2.3(BM) setting high or lower

just popup "RAM check failed", please help, why I can reprogram the MCU, what setting I should I pay more attention to,