0> <info> app: Inside main
 0> <debug> app: In nrf_bootloader_init
 0> <debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
 0> <debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
 0> <warning> nrf_dfu_settings: Restoring settings from backup since the app has tampered with the off-limit parts of the settings page.
 0> <debug> nrf_dfu_settings: Writing settings...
 0> <debug> nrf_dfu_settings: Erasing old settings at: 0x0007F000
 0> <debug> nrf_dfu_flash: nrf_fstorage_erase(addr=0x0x0007F000, len=1 pages), queue usage: 0
 0> <debug> nrf_dfu_flash: Flash erase success: addr=0x0007F000, pending 0
 0> <debug> nrf_dfu_flash: nrf_fstorage_write(addr=0x0007F000, src=0x20006D88, len=440 bytes), queue usage: 1
 0> <debug> nrf_dfu_flash: Flash write success: addr=0x0007F000, pending 0
 0> <debug> app: Enter nrf_bootloader_fw_activate
 0> <info> app: No firmware to activate.
 0> <debug> app: Enter nrf_dfu_app_is_valid
 0> <debug> app: CRC check of app failed. Return 1
 0> <info> nrf_dfu_settings: Backing up settings page to address 0x7E000.
 0> <debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
 0> <debug> app: Running nrf_bootloader_app_start with address: 0x00001000
 0> <debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0
 0> <debug> app: running irq table set
 0> <debug> app: After running irq table set