Resolved! how to write data into stm32l5 flash memory
uint64_t write = 0x1111111122222222;HAL_FLASH_Unlock();if(HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD,0x0807F000,write)==HAL_OK) { HAL_GPIO_WritePin(GPIOG,GPIO_PIN_12,GPIO_PIN_RESET); } HAL_FLASH_Lock();