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App does not work via DFU

I have a nRF51822 device which has softdevice and bootloader. And I'm trying upload my app with following steps:

  1. make .bin file with gcc
  2. Push the DFU button, and entering DFU mode. (Seen as DfuTarg)
  3. Upload bin file via iOS nRF Loader.
  4. The upload completed successfully.
  5. My app does not run.

Therefore, I have a question. Are there any special code or special settings for DFU on the app code side? Thanks in advance.

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