Secure DFU Bootloader over Serial Link Is not Working

[moose]

I am trying to test this example on my nRF52840 DK and it is not working. Here i the steps I followed:

1) Erase the device by clicking "Erase All" under the "Target" menu in segger embedded studio

2) Compiled \examples\dfu\secure_bootloader\pca10056_uart_debug and downloaded it to the device (no changes made to the code or config file)

3) After reset both LED1 and LED3 are on confirming DFU mode

4) Launched a prompt window in admin mode and attempted to program the provided blink image using nrfutil but I am getting an unexpected opcode error. Please see the screenshot below for more details

Please let me know what I need to do. There are bench of tickets referring to hardware control or baud rate. I tried to do these changes but still not working. However not sure if I am doing it correctly. Please provide us with exact steps we need to follow if the provided example documentation is not up to date. Thx!

[Vidar Berg]

I have seen a few cases similar to this lately that have turned out to be caused by an issue with the Segger VCOM. Please try the workaround proposed here: https://docs.zephyrproject.org/1.12.0/tools/nordic_segger.html#disabling-the-mass-storage-device-functionality (note: remember to power-cycle the board after for the change to take effect). I believe the issue has been fixed by the latest Jlink release v.6.70 as well.

[moose]

It worked once I updated j-link version 6.70. I did not try to disable mass storage functionality since I didn't have to with v6.70.

[Vidar Berg]

Thanks for confirming that the issue can be resolved by updating the J-link driver.