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Bootloader only update with DFU

Adrian Eggenberger

I have added the DFU service to our own project. Normal application updates work perfectly and even the update of bootloader and softdevice is fine.

In a new case we had to update the bootloader only. The resulting behavior is a bit odd:

  1. The App downloads the new bootloader (hex-file)
  2. After the new bootloader has been downloaded the device resets to application
  3. This seams to be ok, but when checking the flash the bootloader didn't get updated
  4. After a power cycle the device enters bootmode (Why?)
  5. I download the application to the device and the device reboots to application again
  6. Now the bootloader is updated??? What happens here?

How is the update of only the bootloader working? What should happen after download of the bootloader hex-file?

Regards Adrian

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