Application not run after ble dfu on nrf52840

I use a example application from SDK_DIR\examples\ble_peripheral\ble_app_template\pca10056 base  on nRF5 SDK v17.1.0,then use SDK_DIR\examples\dfu\secure_bootloader\pca10056_s140_ble_debug to write the application.The image i built follow https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/background_dfu_firmware_image.html,i use an android phone to write she zip package and its complete write with no error,but when its reboot,the RTT showed:

00> <info> app: Inside main
00>
00> <debug> app: In nrf_bootloader_init
00>
00> <debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
00>
00> <debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
00>
00> <debug> nrf_dfu_settings: Using settings page.
00>
00> <debug> nrf_dfu_settings: Copying forbidden parts from backup page.
00>
00> <debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
00>
00> <info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
00>
00> <debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
00>
00> <debug> app: Enter nrf_bootloader_fw_activate
00>
00> <info> app: No firmware to activate.
00>
00> <debug> app: App is valid
00>
00> <info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
00>
00> <debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
00>
00> <debug> app: Running nrf_bootloader_app_start with address: 0x00001000
00>
00> <debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0
00>

the info which from the example project "Template example started." not show in RTT,why?

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