DFU using nrfConnect - Remote DFU error: INVALID OBJECT. SD busy? Retrying

RE: DFU using nrfConnect - Remote DFU error: INVALID OBJECT. SD busy? Retrying

Vidar Berg — Fri, 15 Oct 2021 12:06:49 GMT

Hi,

Does it not work with PRN enabled either? In that case, what was the PRN set to, and have you tried to test with '1' (will make DFU really slow).

RE: DFU using nrfConnect - Remote DFU error: INVALID OBJECT. SD busy? Retrying

koniho — Thu, 14 Oct 2021 15:36:28 GMT

Hi Vidar,

When I took a look in the settings, the PRN was already enabled. With PRN disabled, the same behavior occurs.

RE: DFU using nrfConnect - Remote DFU error: INVALID OBJECT. SD busy? Retrying

Vidar Berg — Thu, 11 Feb 2021 09:25:46 GMT

Thanks again for confirming. I suspect the INVALID_OBJECT error (older bootloader version did not have extended error range) is indicating a failure in the post-validation step in this case, but it is not clear why it happens. Could you try enabling "Packets receipt notification" with one packet in nRF connect -> Settings -> Dfu options to see if make any difference.

I used the following setup to try replicate the issue:

- Pixel 2 Android 11

- nRF Connect 4.24.3

- nRF5 SDK 12.3.0

- nRF52 DK

RE: DFU using nrfConnect - Remote DFU error: INVALID OBJECT. SD busy? Retrying

Aleksander Nowakowski — Tue, 09 Feb 2021 16:23:43 GMT

It may be a different Dfu lib version in the apps. But the invalid object error is returned from the device. The only reason why would a different status be returned, apart from different zip file or initial conditions, is some difference in timing on both apps.

RE: DFU using nrfConnect - Remote DFU error: INVALID OBJECT. SD busy? Retrying

koniho — Tue, 09 Feb 2021 14:02:17 GMT

Thanks for the suggestion. We have tried with nrf Toolbox and are able successfully DFU with the same setup. What are the implementation differences for the DFU process between nrf Toolbox and nrf Connect?

RE: DFU using nrfConnect - Remote DFU error: INVALID OBJECT. SD busy? Retrying

Vidar Berg — Thu, 28 Jan 2021 13:26:46 GMT

Thanks for confirming, so it seems like the DFU package is valid at least. It would be good to know if you get the same result with the nRF toolbox to narrow down the problem a bit. I do not recall seeing reports of similiar behaviour before.

RE: DFU using nrfConnect - Remote DFU error: INVALID OBJECT. SD busy? Retrying

koniho — Wed, 27 Jan 2021 16:54:54 GMT

The .zip loads successfully from users of the iOS nrfConnect (not specifically sure what version) and also with our own linux DFU implementation. Will try with nrfToolbox.

RE: DFU using nrfConnect - Remote DFU error: INVALID OBJECT. SD busy? Retrying

Vidar Berg — Tue, 26 Jan 2021 14:08:03 GMT

Hello,

It's strange that it consistently reaches 100%, but then fails to activate the new app. Maybe it's failing in the post validation step where the bootloader validates the integrity check of the received FW image. Could you please try to update the same DFU package with our nRF toolbox, or with a different phone and see if it gives the same result?

Thanks,

Vidar