How to use external flash for SMP DFU

HI

this is my pm_static.pmy

I added the following in app.overlay

After the compilation passed, there was no response when I flashed the device.

this is my p'rj.conf
CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_DISABLE_FLASH_PATCH=y
CONFIG_UART_ASYNC_API=y
CONFIG_NRFX_UARTE0=y
CONFIG_SERIAL=y
CONFIG_GPIO=y

CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y

CONFIG_HEAP_MEM_POOL_SIZE=4096

CONFIG_PRINTK=y
CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y
CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME="YDB_M_"
CONFIG_BT_MAX_CONN=1
CONFIG_BT_MAX_PAIRED=1

CONFIG_BT_NUS=y

CONFIG_BT_SETTINGS=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y

CONFIG_DK_LIBRARY=y
CONFIG_MAIN_STACK_SIZE=2048
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
CONFIG_LOG=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_BACKEND_UART=n
CONFIG_LOG_PRINTK=n
CONFIG_ASSERT=y
CONFIG_REGULATOR=n
CONFIG_BT_HCI_CORE_LOG_LEVEL_ERR=y
CONFIG_BT_HCI_DRIVER_LOG_LEVEL_ERR=y
CONFIG_COUNTER=y
CONFIG_SPI_NOR=y
CONFIG_SPI=y
CONFIG_BMI270=y
CONFIG_SENSOR=y
CONFIG_CBPRINTF_FP_SUPPORT=y
CONFIG_I2C=y
CONFIG_RTC=y
CONFIG_ADC=y
CONFIG_NEWLIB_LIBC=y
CONFIG_FPU=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_FP_HARDABI=y
CONFIG_BT_CENTRAL=y
CONFIG_BT_GATT_CLIENT=y
CONFIG_PM=n
CONFIG_LOG_MODE_OVERFLOW=y
CONFIG_REGULATOR=y

How should I resolve this?

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