why am i not able to update application via ota DFU in MCP

[deepu]

hello,

i am unable to update application or softdevice or bootloader via master control panel 3.9.0 while doing so, it shows error:"FAILED TO OPEN TRANPORT BACKEND".

The thing is i have successfully updated the same via MCP couple of times may be after trying 100 times.

But most of the time this error occurs

please help me

thank you

[Hung Bui]

@Deepu: Please give us more information on:

• Bootloader firmware you used

• Softdevice version

• Steps you did to test the bootloader.

• What board did you use on the PC for MCP for testing ?

• A sniffer trace could be very useful.

[Nate]

Hello, I'm having the same problem, but running MCP as an administrator did not fix the issue. Nor did allowing full access to both log.txt files and the DFU subdirectories. The iOS nRF Toolbox app won't allow me to begin the update process either.

I'm just using the "dfu_test_app_hrm.zip” and dfu_dual_bank_ble_s110_pca10028(nRF51 PCA10028) example from the pack installer in the DFU tutorial and it fails every time with the same error message: "FAILED TO OPEN TRANPORT BACKEND" Does DFU work with the latest versions of the SDK and softdevices? I suspect something has changed since the tutorial was written. Thanks!

[Hung Bui]

@Nate: Please provide information as mentioned in the above comment.

[Nate]

I had two issues. So far one has been solved. Further details are located in the linked questions. Thanks!

1. Failed to follow instructions properly and burn the bootloader (solved).
2. nrfjprog does not accept multiple arguments (unsolved so far).