SDK 15.3 UART DFU Example Not Working

[Navin]

Hello,

I am not able to get the UART DFU secure bootloader example work for PCA10040 nRF52DK.

I have flashed the device with Bootloader and SotDevice 6.1.1 version.

When I run the nrfutil on Ubuntu 16.04 I get this error "pc_ble_driver_py.exceptions.NordicSemiException: Unexpected Executed OP_CODE.
Expected: 0x03 Received: 0xAB"

Command - nrfutil dfu serial -pkg app_s132_for_uart_secure.zip -p /dev/ttyACM0 -fc 0 -b 115200

What is the reason for this error? 

I see that LED1 and LED3 are on initially. Then LED1 and LED2 turn on when I start the command. But the program exits with the error described above.

[Einar Thorsrud]

Hi,

I notice that you don't use flow control. What happens if you enable flow control (assuming you are able to hook up to GPIOs for it)? If not, significantly reducing the baud rate could be worth a try.

[Navin]

Could the problem be with nrfutil? I am using 5.2.0

[Einar Thorsrud]

Hi,

I do not suspect that. However, this issue seems very similar to this thread. Can you try to disable the mass storage device in the onboard debugger using the MSDDisable in JLink Commander, as described here?

[Navin]

Hi Einar,

 Thank you for the suggestion. Indeed it was the JLink that was causing the problem.

I have disabled it using the JLink commander as in the image.

It works fine now!dfu.log

I have attached the log of the output, just in-case someone wants to see how the entire operation takes place.