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  • Case ID: 293392
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Blocked in DFU mode after an upgrade

Etienne

Hi all, 

I have an issue on my device. We have implement OTA update but sometimes, the nfr stucks on DFU mode after the update. Even if the update is succesfull.

We use the nrf 52840 with SDK15.3 and S140 softdevice. 

If we use nrf connect app after the device was stuck on DFU with the same package the update works well and the device reboot normaly. 
We don not understand why sometimes the device is stuck in DFU mode. 

Is there a way out on the NRF connect app tu restart the nrf52840 ? 

Best regards

Etienne

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  • 0 in reply to Edvin

    We just try both to be sure and we have the same result with both, Custom app and NRF Connect for Android app.

    The strange thing is we try to send the same package with SD+BL + APP while the device was stuck in DFU mode and it works well the second time. 

    I try to use the debug bootloader project but I do not reproduce the issue... 

    So I do not know how to procced to debug this issue.

    Regards, 

    Etienne 

  • 0 in reply to Etienne

    Are you able to reproduce the issue on a DK + nRF Connect for Android? If so, I can try to reproduce the issue here locally, and see if I can find anything.

    If so, please send the bootloader and application projects that you are using. You can strip out the private and public keys that you are using for security concerns. I can generate my own key pairs.

    Best regards,

    Edvin

  • 0 in reply to Edvin

    Please see the message I sent you in the chat regarding the files that you sent me.

    Another thought is: Did you try to send the DFU image using nRF Connect for Desktop?

    While I understand that this is not what you want to do in the end, it may be useful for debugging purposes. Does it work there? If not, what does it say? If it doesn't work, it is actually a good thing, because then we would know that the DFU server and the image transport will be the exact same for me and you. Then we only need to reproduce the issue on a DK.

    Best regards,

    Edvin

  • 0 in reply to Edvin

    Hi, 

    We may find something on the verification of the settings that does not goes well and write lot of settings page and erase bank size, bank crc and bank code values so the application can't reboot after this operation. 

    We keep looking aroud this. 

    Thanks for your help.

    Best regards, 

    Etienne 

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