Power off during DFU upgrade

RE: Power off during DFU upgrade

Vidar Berg — Wed, 04 Nov 2020 14:28:54 GMT

[quote user="RahulR"]In this case, if application gets corrupted during copying new firmware, it should at-lease broadcast in boot-loader mode, right?[/quote]

Yes, worst case should be that the device falls back to DFU mode. I think the fact that it becomes bricked indicates that the bootloader is activating an invalid or corrupted application image. To get a better picture of what the problem is I think it would help if you could read out flash after a failed and succesfull DFU then compare the differences.

Reading flash with nrfjprog

nrfjprog --memrd 0x0 --n <size of flash in bytes> > flash_content.txt

RE: Power off during DFU upgrade

RahulR — Wed, 04 Nov 2020 11:29:09 GMT

I am upgrading only Application.

In this case, if application gets corrupted during copying new firmware, it should at-lease broadcast in boot-loader mode, right?

RE: Power off during DFU upgrade

Vidar Berg — Wed, 04 Nov 2020 09:37:38 GMT

I don't recall any known issues with the copy routine in SDK 11, only with the secure bootloader introduced in SDK 12. Are you updating SD+BL, APP, or both when this happens?

RE: Power off during DFU upgrade

RahulR — Tue, 03 Nov 2020 13:22:25 GMT

SDK 11.0.0

RE: Power off during DFU upgrade

Vidar Berg — Tue, 03 Nov 2020 12:37:23 GMT

Hi,

Please let me know which SDK version this is based on. The copy routine is supposed to withstand unexpected resets, but I remember we had some problems with the earlier implementations of it that could potentially leave the device bricked.