Failure upgrading with DFU

RE: Failure upgrading with DFU

Hung Bui — Thu, 25 Mar 2021 13:18:46 GMT

Hi,

Please try capture a sniffer trace when you do DFU update. You would need an extra nRF52/dongle to be used as the sniffer.

From what you described, it seems that the nRF Connect app couldn't write the command to your application to switch to bootloader mode.

Please check if you have any assert/crash on your device when testing. Please check if you have any log.

Please let us know which SDK you based your application& bootloader, I know you use the DK, but the SDK is the software development kit that you based your application on.

To flash a stock bootloader, just go to the SDK that you use and try compiling and flash the bootloader (\examples\dfu\secure_bootloader) firmware to test.

When you flash your application did you also flash the bootloader ?

RE: Failure upgrading with DFU

Ronen — Wed, 24 Mar 2021 14:38:52 GMT

Dear Hung Bui,

Follow your questions,

What exactly happened when you try to do DFU ? - Please see below:

When I open the BLE nRF connect it's looking OK.

Choosing my board

I have already selected the SDK nRF52840-DK and still looking OK

Choosing the DFU file and click "Start DFU"

And after a few seconds got a white screen:

Or sometimes got the next note:

Which SDK your bootloader based on ? - nRF52840-DK

If you flash and test the stock bootloader from the SDK would it work ? - Sorry, please explain it...

Have you tested if a normal BLE application still works on those board ? Yes! the BLE is working properly with our application.

RE: Failure upgrading with DFU

Hung Bui — Wed, 24 Mar 2021 13:27:05 GMT

Hi Ronen,

We would need to get more debug information to analyse what could be wrong here.
Could you get some log from the bootloader when it fails ?

What exactly happened when you try to do DFU ?

Which SDK your bootloader based on ?

If you flash and test the stock bootloader from the SDK would it work ?

Have you tested if a normal BLE application still works on those board ?