Hi Shuqing Can you please call below function before program/erase command? This will resolve your issue. Fapi_setupBankSectorEnable(FLASH_WRAPPER_PROGRAM_BASE+FLASH_O_CMDWEPROT_UO, 0x00000000); Refer flash API user guide for more details http://www.ti.com/lit/pdf/sprujc5 Regards, Rajeshwary
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